First trimester · 38 weeks to go
| Fact | Week 2 |
|---|---|
| Days of pregnancy | 8–14 since LMP |
| Gestational age span | 1w0d to 1w6d |
| Trimester | First trimester (weeks 1–13) |
| Pregnancy month | Month 1 (weeks 1–4) |
| Average length | not yet measurable (too small to measure) |
| Average weight | not yet measurable |
| Size comparison | a ripening follicle |
| Weeks remaining | 38 (40-week due date) |
Week 2 is still pre-conception: your body is finishing preparations while a dominant follicle ripens in one ovary. The uterine lining thickens to receive a possible embryo. Ovulation, and with it conception, happens around the end of this week on a typical 28-day cycle.
Rising luteinizing hormone will trigger ovulation, releasing the egg into the fallopian tube where sperm may be waiting. An egg survives only 12 to 24 hours after release, which is why the fertile window spans the days just before ovulation too.
Gestationally, week 2 means you are 1 weeks and 0 to 6 days pregnant, day 8 to day 14 counted from the first day of your last period. This is week 2 of the first trimester (weeks 1–13). Prenatal appointments run about every four weeks in this stretch. Week 4 brings a positive home pregnancy test as hCG rises. If your cycle runs longer or shorter than the 28 days the due-date math assumes, your ovulation date and due date shift with it, which is why a first-trimester ultrasound remains the gold standard for dating. Every number on this page is an average across pregnancies; your own scan dates and your baby's measurements are what actually describe your week 2.
Track ovulation signs or use a predictor kit this week; knowing your ovulation date makes later dating more accurate than a remembered period alone.
Weeks of pregnancy don't map cleanly to calendar months, but the common division puts week 2 falls in month 1 of pregnancy (weeks 1–4). Week 2 is part of the first trimester, which runs from week 1 to week 13. Gestationally, week 2 means you are 1 weeks and 0 to 6 days pregnant.
At week 2 there isn't much to measure yet; the baby is on the scale of a ripening follicle. Measurable length in inches begins with the embryo stage in the next few weeks.