Quick Summary — Pregnancy Week 4 (1st Trimester) At 4 weeks pregnant, your baby is approximately the size of a poppy seed (1 mm, —) with 252 days remaining until your estimated due date.

🧒 Baby Development

The embryo is now the size of a poppy seed. The neural tube (brain and spinal cord), heart, and blood vessels are forming. The amniotic sac and yolk sac are established.

🤰 What Mom Is Feeling

Your period is due — a missed period is often the first sign. Early symptoms may include breast tenderness, fatigue, and mild nausea. hCG is rising.

💡 Tips for This Week

Take a home pregnancy test! This is the earliest week most tests will show a positive result. Schedule your first prenatal appointment.

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