First Trimester Milestones Week by Week
Track first trimester milestones from week 4 through week 13 — heartbeat scan, nuchal translucency, and end of first trimester dates calculated from your LMP.
The first trimester runs from your LMP through week 13. Key clinical milestones include: a positive home pregnancy test around week 4; a detectable heartbeat on transvaginal ultrasound at 6–7 weeks; rapid organ formation through week 10; and the nuchal translucency (NT) scan between weeks 11 and 13 that screens for chromosomal differences. Enter your LMP date in the calculator above to get exact calendar dates for each of these milestones. Most miscarriage risk drops significantly after week 12, which is why many people wait until after the first trimester to share their news.
Use the full First Trimester Milestones Week by Week
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