Baby's development
- Blastocyst implants in the uterine wall.
- Three germ layers form, foundation of every organ.
T1 · First TrimesterWeek 4 of 40
Implantation in the uterine lining. The placenta and amniotic sac start to form. A home pregnancy test can turn positive late this week.
Progress10% · 36 weeks left
- Baby size
- Poppy seed
- Length
- 0.1 cm
- Weight
- —
What's happening to you
- Possible light implantation spotting.
- Breast tenderness and mild fatigue may begin.
Tips for this week
- Take a home pregnancy test once your period is late.
- Schedule a confirmatory blood beta-hCG test.