Your period is late, the test is positive (or about to be), and a poppy-seed-sized beginning is officially underway. Welcome to week 4 — the week you find out! Here's your calm, complete guide to what's happening now.
Your baby this week. Your baby is the size of a poppy seed, and an enormous construction project is already running. The fertilized egg has implanted into the wall of your uterus and is organizing itself into the layers that will become every organ, while the foundations of the placenta and amniotic sac are being laid. It doesn't look like a baby yet — but the blueprint is being drawn at full speed.
Your body & the very first symptoms. Many moms feel almost nothing yet, and that's normal. Others notice the earliest whispers: mild cramping, light spotting from implantation, tender breasts, or a tiredness that seems out of proportion. Rising hCG — the hormone pregnancy tests detect — is behind all of it.
The positive test: timing, faint lines & what it means. A faint line is still a positive line. Tests work best with first-morning urine, and testing after a missed period gives the most reliable result. A negative test with a still-late period? Wait a few days and test again — hCG roughly doubles every couple of days in the beginning.
First steps after a positive. Start (or keep taking) folic acid, write down the first day of your last period — that's how your due date is calculated — and book your first prenatal appointment. Skip alcohol, check any medications with your provider, and give yourself a moment: this is big news.
Warning signs. From day one, know the line: heavy bleeding, severe one-sided pelvic pain, shoulder-tip pain, dizziness or fainting all deserve a prompt call to your provider.
Next up: Week 5, when your baby's heart begins.
Key takeaways:
- Your baby is poppy-seed sized; implantation and the placenta's foundations are underway
- A faint line is a positive line — test after a missed period for reliability
- Start folic acid now and note the first day of your last period
- Heavy bleeding or severe one-sided pain = call your provider promptly
Watch the full week-by-week series on Bump & Bloom: https://www.youtube.com/@HelloBumpAndBloom — and for your older little one while you rest, see our activity books: https://www.amazon.com/author/tanvirahmed?tag=nestpicks09-20
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General information only, not medical advice. Always follow your own doctor or midwife for personal care.
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