Baby's development
- No conception yet — uterine lining begins shedding then rebuilding.
- Follicles in the ovaries start maturing.
T1 · First TrimesterWeek 1 of 40
Week 1 is counted from the first day of your last menstrual period. You are not pregnant yet — your body is preparing to ovulate.
Progress3% · 39 weeks left
- Baby size
- Poppy seed (notional)
- Length
- —
- Weight
- —
What's happening to you
- Menstrual period typical.
- Hormone levels reset for the next ovulation cycle.
Tips for this week
- Start a prenatal vitamin with folic acid (400–800 mcg) daily.
- Stop alcohol, smoking and recreational drugs.
- Note the first day of your period — it anchors your due date.