Find out how many weeks pregnant you are, your current trimester, and key milestones. Enter your last period or due date.
Pregnancy weeks are counted from the first day of your last menstrual period (LMP), not from conception. A full-term pregnancy is 40 weeks (280 days) from LMP.
First trimester: weeks 1–12. Second trimester: weeks 13–26. Third trimester: weeks 27–40. Each brings different fetal development milestones and physical changes.
The mid-pregnancy anatomy ultrasound is typically scheduled between weeks 18–22. It checks fetal development and can usually reveal the baby's sex.
Full term is weeks 39–40. Early term is 37–38 weeks. Babies born before 37 weeks are preterm. Outcomes are best for babies born at 39–40 weeks.
As soon as you confirm pregnancy. Most providers schedule the first prenatal visit between weeks 8–10. Regular check-ups throughout pregnancy are essential.
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