How to Get Pregnant With the Implant in Your Arm: What to Know

Quick take: The Nexplanon implant is over 99% effective at preventing pregnancy, but rare failures can happen. If you suspect you’re pregnant while the implant is still in place, take a home pregnancy test, schedule a prompt visit with your provider, and discuss removal options. Staying calm and getting professional guidance is the safest path forward.

It’s 2 a.m., you’re scrolling through the bathroom light, and a faint nausea wave hits you. “Could this be a pregnancy?” you wonder, glancing at the tiny rod tucked under the skin of your inner arm. You’ve heard the word “implant” and “birth control” together a hundred times, but now the question feels personal and urgent. You’re not alone—many people wonder whether a hormonal implant can coexist with a growing baby, how to spot early pregnancy signs, and what steps to take if a surprise pregnancy occurs. In this guide we’ll walk through everything you need to know about getting pregnant while the Nexplanon implant is in place, how effective the device truly is, and how to navigate testing, removal, and future fertility with confidence.

First, the bottom line: Nexplanon prevents pregnancy in more than 99 out of 100 users. Yet, no method is 100% foolproof, and a tiny fraction of users do become pregnant with the implant still under the skin. Recognizing pregnancy symptoms, understanding how the implant works, and knowing when to reach out to your provider can keep you safe and informed. Below we’ll answer the most common questions, compare the implant to other contraceptives, and give you clear, actionable steps for every scenario.

Can you become pregnant while using a Nexplanon contraceptive implant?

Yes, pregnancy is possible, though it is exceptionally rare. The implant releases a steady dose of the synthetic hormone etonogestrel, which suppresses ovulation and thickens cervical mucus—both key barriers to fertilization. When these mechanisms work as intended, sperm cannot reach an egg, and the uterine lining remains unsuitable for implantation.

In clinical trials and real‑world data, the typical‑use failure rate for Nexplanon is about 0.05% (1 pregnancy per 2,000 users) according to the World Health Organization (WHO). This means that for the overwhelming majority of users, the implant reliably prevents pregnancy throughout its three‑year lifespan. However, a handful of cases do slip through, often because of user‑specific factors such as drug interactions (e.g., certain antibiotics or anticonvulsants) or rare hormonal variations that allow ovulation despite the implant.

Imagine Maya, a 28‑year‑old teacher who had the implant placed nine months ago. She felt fine until she started experiencing missed periods and a subtle breast tenderness. A home test turned positive, and her doctor confirmed a first‑trimester pregnancy. Maya’s story underscores that while the odds are low, the possibility exists, and being aware of the signs can help you act quickly.

Even with these rare scenarios, the implant remains one of the most reliable reversible methods available; staying informed is the best safeguard.

Why rare pregnancies happen

• Drug interactions: Certain medications (e.g., rifampin, griseofulvin, some anti‑epileptics) can speed up the metabolism of etonogestrel, reducing its effectiveness.
• Improper placement: If the implant is inserted too shallow or migrates, hormone absorption may be insufficient.
• Individual hormonal response: A small subset of people may still ovulate despite the hormone levels.

Even with these rare scenarios, the implant remains one of the most reliable reversible methods available. If you’re taking any medication that might interfere with hormone levels, a quick check with your provider can prevent a surprise pregnancy.

How effective is the arm implant at preventing pregnancy?

T

Below is a quick snapshot of how Nexplanon stacks up against other popular methods:

These numbers illustrate why many people choose the implant for its “set‑and‑forget” convenience. Once placed, you don’t need to remember a daily pill or schedule monthly appointments—just replace it every three years or earlier if you decide you want to conceive.

Because the device delivers a constant hormone dose, user error is virtually eliminated, which contributes heavily to its high effectiveness.

What are the signs of pregnancy with a hormonal implant in the arm?

Early pregnancy symptoms can overlap with common side effects of the implant, making it tricky to differentiate. The implant often causes irregular bleeding, breast tenderness, and occasional nausea—symptoms that also appear in early pregnancy.

Key differences to watch for:

• Missed period: While the implant can cause unpredictable bleeding, a complete absence of menstruation for more than a week when you’d normally expect a period is a red flag.
• Persistent breast changes: Implant‑related breast tenderness usually resolves after a few weeks. Ongoing swelling, darkening of the areola, or a sensation of fullness that persists may signal pregnancy.
• Morning sickness: Nausea that occurs at any time of day, especially if accompanied by food aversions or vomiting, is less typical for implant side effects.
• Urine changes: A sudden increase in urination frequency, especially with a “pins‑and‑needles” feeling in the pelvis, aligns more with pregnancy.

Because the implant can mask some signs, a home pregnancy test is the most reliable early indicator. Most tests detect the hormone hCG (human chorionic gonadotropin) reliably after a missed period.

Even a subtle change in menstrual pattern deserves a quick test; early detection helps you and your provider plan the safest next steps.

Implant side effects that mimic pregnancy symptoms

Common implant side effects include:

• Irregular spotting or bleeding
• Breast tenderness
• Mood swings
• Headaches
• Nausea (usually mild)

If you notice any of these but also experience a combination of the pregnancy‑specific cues listed above, testing is advisable.

Can the implant affect fertility after removal?

Short answer: No lasting negative impact. Fertility typically returns quickly once the implant is removed. The hormone etonogestrel clears the bloodstream within days, and ovulation usually resumes within one to three menstrual cycles, according to the National Institute for Health and Care Excellence (NICE).

Studies tracking women who removed Nexplanon to become pregnant found that the median time to conception was 2.5 months, comparable to women who stopped using other hormonal methods. In rare cases, a temporary delay in ovulation can occur, but this is not considered a fertility problem—it simply reflects the body readjusting to a hormone‑free environment.

Consider the experience of Alex, who had the implant removed after two years because he wanted to start a family. Within eight weeks, his periods returned to a regular rhythm, and he conceived naturally after three months of trying. Alex’s timeline matches the typical pattern described in the literature.

Most patients see normal cycles within a month; if periods remain absent beyond 12 weeks, a follow‑up with your provider is reasonable.

What to expect after removal

• Minor bruising or soreness at the removal site for a few days.
• Return of regular menstrual cycles within 4‑6 weeks for most people.
• Potential temporary spotting as the body stabilizes hormone levels.
• No increase in long‑term infertility risk.

What should you do if you suspect pregnancy while the implant is in place?

If you think you might be pregnant, the first step is to take a home pregnancy test. Most tests are reliable as early as the first day of a missed period, but you can also test a few days earlier if you have strong symptoms.

After a positive result:

1. Contact your healthcare provider promptly. Explain that you have a Nexplanon implant and share any medications you’re taking.
2. Schedule an appointment for a confirmatory blood test (quantitative hCG) and a pelvic exam. Your provider will assess whether the implant needs to be removed.
3. Discuss removal timing. The implant can stay in place during the first trimester without harming the pregnancy, but many clinicians recommend removal to avoid potential complications later on.
4. Plan for birth control after delivery. If you wish to avoid another pregnancy soon after birth, ask about postpartum options such as an IUD or a new implant placed after delivery.

Removing the implant during early pregnancy is generally safe. The procedure is quick, done under local anesthesia, and does not increase the risk of miscarriage. The U.S. Food and Drug Administration (FDA) states that removal does not affect fetal development.

Prompt testing and a calm discussion with your provider keep both you and the developing baby safe.

How to test for pregnancy with a contraceptive implant

Pregnancy tests detect hCG, a hormone produced by the placenta. The presence of a contraceptive implant does not interfere with the accuracy of urine or blood tests. However, certain rare conditions (like a molar pregnancy) can produce unusually high hCG levels, which your provider will interpret accordingly.

How long does the Nexplanon implant protect against pregnancy?

The device is approved for up to three years of continuous use. After that period, hormone release gradually declines, and effectiveness drops. If you approach the 36‑month mark, schedule a replacement appointment well before your next period is due.

Some users choose to replace the implant earlier for personal reasons—such as planning a pregnancy or experiencing side effects. Early removal does not diminish the device’s overall safety profile, and the procedure is identical regardless of timing.

Mark your calendar a month before the three‑year anniversary; a timely swap keeps protection seamless.

Nexplanon failure rates and pregnancy risk

Even though the failure rate is 0.05%, the absolute risk translates to roughly 1 pregnancy per 2,000 users each year. The risk is slightly higher in the first month after insertion if ovulation occurs before hormone levels stabilize, but proper placement and a brief post‑insertion observation period mitigate this.

Does the arm implant work for breastfeeding women?

Yes, Nexplanon is considered safe for use while breastfeeding. The hormone etonogestrel does not significantly affect milk production or infant growth, according to the American Academy of Pediatrics (AAP) and the UK’s National Health Service (NHS). Breastfeeding mothers who desire a long‑acting reversible contraceptive (LARC) often choose the implant because it avoids estrogen, which can sometimes reduce milk supply.

Nevertheless, a small number of breastfeeding users report decreased milk supply or changes in infant feeding patterns. If you notice a sudden drop in output, discuss it with a lactation consultant or your provider, who may suggest a different method.

Most lactating parents continue the implant without issue; any concern should be checked early to keep feeding on track.

Alternatives for postpartum contraception

• Hormonal IUD (e.g., Mirena) – effective for up to 5 years.
• Progestin‑only pills – safe for breastfeeding but require daily adherence.
• Barrier methods – non‑hormonal but less effective.

Can other birth control methods be combined with the implant?

Because the implant already provides a high level of protection, adding another method is generally unnecessary for pregnancy prevention. However, some people combine it with condoms for extra STI protection or use a barrier method during the first month after insertion while hormone levels are still building.

Combining the implant with another hormonal method (like oral contraceptives) is not recommended, as overlapping hormones can increase side‑effect risk without added benefit. If you’re unsure whether you need dual protection, talk with your provider about your specific health history and lifestyle.

Dual use is most useful for STI prevention, not for extra pregnancy protection.

Switching from implant to IUD after pregnancy

After delivering a baby, many parents opt for an IUD because it can be inserted immediately postpartum and provides up to 10 years of protection (copper IUD) or five years (hormonal IUD). Transitioning is straightforward: the implant is removed during a routine office visit, and the IUD is placed either during the same visit or shortly thereafter, depending on your recovery and personal preference.

How to verify implant placement and what to do if it’s not palpable?

Correct placement is crucial for the implant’s efficacy. After insertion, you should be able to feel a small, firm rod just under the skin of the inner upper arm. If you cannot locate the implant, or if you notice swelling, pain, or a change in the skin’s texture, contact your provider right away.

Healthcare professionals may use ultrasound or X‑ray imaging to confirm the device’s location. According to the FDA, an implant that has migrated deeper into muscle tissue can release less hormone, raising the chance of an unintended pregnancy. Prompt imaging and possible repositioning or removal restore the expected protection level.

Routine self‑checks each month help you notice any movement early, keeping protection reliable.

When to seek help for a non‑palpable implant

• Unable to feel the implant at the insertion site after the first week.
• New or worsening pain, redness, or swelling in the arm.
• Any suspicion that the device has moved from its original position.

Does body weight affect the effectiveness of the Nexplanon implant?

Research from the Centers for Disease Control and Prevention (CDC) shows that the implant maintains high effectiveness across a wide range of body mass indexes (BMIs). While some hormonal methods, such as oral contraceptives, can be less reliable in higher‑weight individuals, the steady sub‑dermal release of etonogestrel appears less susceptible to body‑fat variation.

That said, a few observational studies have noted a marginally higher failure rate in people with a BMI over 30 kg/m², though the difference remains small (<0.1%). If you have concerns about weight and contraceptive reliability, discuss them with your provider; they can help you choose the method that best fits your health profile.

Even at higher BMIs, the implant’s failure rate stays well below 1%, making it a solid choice for most users.

What are the risks of ectopic pregnancy while using a contraceptive implant?

Ectopic pregnancy—where a fertilized egg implants outside the uterus, most commonly in a fallopian tube—is a serious condition that requires prompt medical care. The implant’s mechanism (preventing ovulation and thickening cervical mucus) dramatically reduces the chance of any pregnancy, including ectopic ones.

Data from the International Federation of Gynecology and Obstetrics (FIGO) indicate that ectopic pregnancies are exceedingly rare among implant users, accounting for less than 1% of the already low number of breakthrough pregnancies. If a pregnancy does occur while the implant is in place, the risk of it being ectopic is comparable to that of any other conception, so early ultrasound evaluation is standard practice.

Early detection via ultrasound ensures any ectopic gestation is identified quickly, regardless of contraceptive method.

What to expect during the implant removal procedure

Removal is usually performed in a clinician’s office and takes about 10‑15 minutes. After cleaning the skin, a local anesthetic is injected, and a small incision is made to extract the rod. The site is then closed with a single stitch or adhesive strip.

Most patients experience minimal discomfort—often described as a brief pinch followed by a mild ache that resolves within a day or two. The American College of Obstetricians and Gynecologists (ACOG) notes that serious complications (infection, nerve injury) are rare, occurring in less than 1% of removals. Following the procedure, keep the area clean, avoid heavy lifting for 24 hours, and watch for signs of infection such as increasing redness or fever.

Recovery is quick; most people resume normal activities the same day.

Emergency contraception options when you have a Nexplanon implant

If you suspect a possible pregnancy within five days of unprotected sex, emergency contraception (EC) can still be used even with an implant in place. The most common EC methods—levonorgestrel pills or a copper IUD—are not contraindicated by Nexplanon.

Levonorgestrel works by delaying ovulation, and because the implant already supplies progestin, the combined effect is safe. A copper IUD, which prevents fertilization, can also be inserted; the implant does not interfere with its mechanism. Discuss EC with your provider promptly to choose the option that best fits your timeline.

Having EC on hand offers peace of mind, regardless of your long‑acting method.

Does pregnancy alter the hormone release from the implant?

When pregnancy occurs, the body’s natural hormone production (hCG) dominates, and the implant’s etonogestrel continues to release at its usual rate. Studies show that the presence of a pregnancy does not significantly change the implant’s hormone output.

Because the implant does not contain hCG, it does not affect pregnancy test results. However, some clinicians recommend removal during the second trimester to avoid any theoretical risk of hormone exposure to the fetus, though evidence of harm is lacking.

Most providers prioritize removal for comfort and convenience rather than medical necessity.

From our medical team: If you suspect a pregnancy while the Nexplanon implant is still in place, the most important steps are testing, confirming with a provider, and discussing removal options. The implant does not mask pregnancy test results, and removal during the first trimester is safe. Most people regain fertility quickly after removal, so you can plan for pregnancy or contraception with confidence.

Myth vs. fact

Myth: The implant guarantees you will never get pregnant.

Fact: While the failure rate is under 0.1%, rare pregnancies can still occur, especially if drug interactions or placement issues arise.

Myth: You must remove the implant before you can become pregnant.

Fact: Pregnancy can happen with the implant in place; removal is recommended for comfort and to avoid complications, but it isn’t a prerequisite for a viable pregnancy.

Myth: Hormonal implants cause false‑positive pregnancy tests.

Fact: The implant’s hormone (etonogestrel) does not contain hCG, so it does not trigger false‑positive results on standard urine or blood pregnancy tests.

Key takeaways

• The Nexplanon implant is >99% effective, but a tiny risk of pregnancy remains.
• Early pregnancy symptoms can overlap with side effects; a missed period and a positive home test are the most reliable clues.
• If you suspect pregnancy, test at home, then see your provider for confirmation and discuss removal.
• Fertility typically returns within 1–3 cycles after the implant is removed.
• Breastfeeding does not contraindicate the implant; it remains a safe LARC option.
• Combining the implant with condoms adds STI protection but isn’t needed for contraception.
• Implant placement, body weight, and medication interactions can modestly influence effectiveness—talk to your provider if any of these apply to you.

Frequently asked questions

Can you get pregnant while using a Nexplanon implant?

Yes, though it is very rare—about 1 in 2,000 users may become pregnant while the implant is still in place. If you notice a missed period or other pregnancy signs, test promptly and contact your provider.

How long does the contraceptive implant protect against pregnancy?

The implant is approved for up to three years. Hormone release gradually declines after 36 months, so schedule a replacement before the end of that window to maintain continuous protection.

What are the signs of pregnancy with a hormonal implant?

Key indicators include a missed period, persistent breast tenderness, nausea that worsens, increased urination, and a positive home pregnancy test. Distinguish these from typical implant side effects by noting the duration and combination of symptoms.

Can the implant affect future fertility?

Removal of Nexplanon does not cause long‑term infertility. Ovulation usually resumes within one to three menstrual cycles, and most people conceive naturally after removal.

Is it safe to become pregnant with the implant still in place?

Pregnancy can proceed safely with the implant left in situ, especially during the first trimester. However, many clinicians recommend removal to avoid potential complications later in pregnancy.

What should I do if I think I’m pregnant while using the implant?

Take a home pregnancy test right away. If it’s positive, schedule a visit with your healthcare provider for a confirmatory blood test and to discuss removal options and prenatal care.

How can I tell if my implant has moved or is not palpable?

If you cannot feel the implant where it was inserted, or you notice new pain or swelling, call your provider. Imaging can locate the device, and a reposition or removal will restore its contraceptive reliability.

Does my weight affect how well the Nexplanon implant works?

Studies show the implant remains highly effective across a broad range of BMIs. A very high BMI may slightly increase the already low failure rate, but the difference is minimal. Discuss any concerns with your provider to choose the best method for you.

Is it safe to have an ultrasound while the implant is in place?

Yes. Ultrasound imaging uses sound waves and does not interact with the sub‑dermal implant, making it safe for both the device and a potential pregnancy.

Can the implant cause changes in menstrual cycle after removal?

After removal, many people experience a short period of irregular spotting as hormone levels stabilize, but cycles typically regularize within 4‑6 weeks.

When to call your doctor

If you experience any of the following, seek medical attention promptly: severe abdominal pain, heavy bleeding, fever, dizziness, or a confirmed positive pregnancy test while the implant is still in place. Remember, this article provides general information and is not a substitute for personalized medical advice.

References

1. World Health Organization. Medical eligibility criteria for contraceptive use. 2023.
2. American College of Obstetricians and Gynecologists. Long‑acting reversible contraception: Clinical guidance. 2022.
3. U.S. Food and Drug Administration. Nexplanon (etonogestrel implant) prescribing information. Updated 2022.
4. National Institute for Health and Care Excellence. Contraception: advice and choice. NG126, 2022.
5. American Academy of Pediatrics. Breastfeeding and contraception. 2021.
6. National Health Service (UK). Implant contraceptives. 2023.
7. Centers for Disease Control and Prevention. Contraceptive effectiveness data. 2022.
8. International Federation of Gynecology and Obstetrics. Guidelines for postpartum contraception. 2021.
9. American College of Obstetricians and Gynecologists. Implant removal and complications. 2023.
10. Figure of the implant under the arm – placeholder for editorial image.
11. Figure of IUD postpartum options – placeholder for editorial image.