Pregnancy Week 4: What to Expect
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Medically reviewed by
Baby Circle Medical Board
Reviewed on 12 July 2026
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Your baby is about the size of a Poppy seedApprox. ~2 mm · First trimester
Your baby this week
Your baby is a tiny ball of fast-dividing cells (a blastocyst) burrowing into the womb lining. The amniotic sac and placenta start forming, and the neural tube — the future brain and spinal cord — begins to develop.
Your body this week
A missed period and a positive test are the usual first clues. You may notice light implantation spotting, mild cramps, tender breasts and tiredness as hCG rises.
💡 Tips for week 4
- Start folic acid (400–800 mcg) today if you haven't
- Stop alcohol and smoking completely
- Note the first day of your last period for dating
✅ To do this week
- Confirm with a home pregnancy test
- Book your first antenatal appointment
- Review any medicines with your doctor
Common questions — Week 4
Is spotting at 4 weeks normal?
Light implantation spotting can be normal, but heavy bleeding or severe pain needs prompt medical attention.
Why folic acid so early?
It helps prevent neural-tube defects, and the neural tube is forming right now — so earlier is better.
Track your week with The Circle 💜
Private, doctor-supported community for parents due the same month as you.
Join The CircleFull 40-Week GuideReferences
- World Health Organization (WHO). WHO recommendations on antenatal care for a positive pregnancy experience. who.int
- American College of Obstetricians and Gynecologists (ACOG). Your Pregnancy and Childbirth. acog.org
- NHS. Week-by-week guide to pregnancy. nhs.uk
- Centers for Disease Control and Prevention (CDC). During Pregnancy. cdc.gov
- UNICEF. Maternal and newborn health. unicef.org
- Indian Academy of Pediatrics (IAP). iapindia.org
Medical disclaimer: This article is for general education only and is not a substitute for professional medical advice. Always consult your doctor about your pregnancy, and seek care immediately for any warning signs. Reviewed by the Baby Circle Medical Board.