Week 3 Pregnancy
You are 3 weeks pregnant and in your first trimester. Your baby is about the size of a microscopic grain of sand. This week's key development: The Meeting.
Baby's Development
Your baby is about the size of a microscopic grain of sand.
The Meeting — Conception has occurred, and a single fertilised cell is dividing rapidly as it travels toward your uterus. This blastocyst — a tiny sphere of potential — is beginning to nestle into your uterine lining by the end of this week.
Your Symptoms
- Possible light spotting (implantation)
- Mild cramping
- Heightened sense of smell
Every pregnancy is different. You may experience all, some, or none of these symptoms — and that's completely normal. If anything concerns you, speak to your midwife.
NHS Appointments
None yet. You might not even know you're pregnant for another week or two!
Practical Advice for Week 3
Nutrition
- Continue folic acid and vitamin D supplements without fail.
- Eat calcium-rich foods like dairy, fortified plant milks, and leafy greens.
- Small, frequent meals can help if you're starting to feel queasy.
- Avoid liver and liver products (pâté) due to high vitamin A levels.
Exercise
- Continue moderate exercise — your body is doing incredible work already.
- Avoid contact sports or activities with a high risk of falling.
- Pelvic floor exercises — keep going, they'll be invaluable later.
- Walking after meals can help with digestion.
Wellbeing
- You might not know you're pregnant yet, and that's completely normal.
- If you are experiencing implantation spotting, try not to worry — it's very common.
- Practise mindfulness or deep breathing if you're feeling anxious.
- Lean on your support network — this is a time to be kind to yourself.
Preparation
- If you get a positive test, contact your GP or midwife to start your maternity care.
- Avoid alcohol, smoking, and recreational drugs.
- Check your workplace maternity policy early — knowledge is power.
- Start thinking about which hospital or birth centre you'd prefer.
Tip of the Week
Avoid alcohol and smoking as your baby begins its first critical stages of development.
Track Your Due Date
Keep track of your pregnancy milestones, NHS scans, and countdown to your due date.
Go to TrackerNHS Resources
Find trusted information on financial support, antenatal classes, and local maternity services.
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