All weeks
First Trimester
Week 5 of pregnancy
Your baby is the size of a sesame seed.
Length: 0.5 cm / 0.2 in
Baby at 5 weeks
- The heart begins to beat — initially as simple muscle pulses.
- Neural tube (future brain + spinal cord) is forming.
- Tiny limb buds appearing.
What you may feel
- Nausea may start.
- Breast tenderness intensifies.
- Fatigue.
- Frequent urination beginning.
This week’s checklist
- Confirm GP / midwife booking appointment (usually scheduled for 8-10 weeks).
- Continue folic acid + vitamin D.
- Cut caffeine to under 200 mg/day.
Key milestone
Heartbeat begins — though not visible on ultrasound yet.
Doctor / midwife visits
First midwife booking call to schedule.
Top foods this week
Educational only — not medical advice. Always consult your midwife or GP. Sources: NICE NG201 antenatal care, NICE NG207 inducing labour, NHS, RCOG. Read the full medical disclaimer.