Mar 18, 2025 · Conception typically happens about two weeks after the last period begins. But to find your estimated due date, your healthcare professional counts ahead 40 weeks from the start of your last period. That means the period is counted as part of your pregnancy timeline even though you weren't pregnant at the time.
Dec 24, 2025 · The brain, spinal cord and other organs are forming. The heart begins to beat. Fingers and toes begin to take shape. When you find out you're pregnant , make an appointment with your health care provider to begin prenatal care. You'll learn what to expect during the first trimester and beyond.
May 1, 2026 · The first trimester covers week 1 through week 13 of pregnancy, ending at 13 weeks and 6 days. That’s roughly the first three months, counted from the first day of your last menstrual period (LMP).
Oct 31, 2024 · Learn about your baby's development from conception through the first four weeks of your pregnancy in WebMD's Pregnancy Week by Week guide.
May 6, 2026 · The first trimester spans weeks 1–13 , starting before conception. Learn what’s developing, when symptoms peak, and which nutrients and screenings matter most.
The first few weeks of pregnancy can be so exciting! But when should you tell people around you that you are pregnant? And what should you expect? Learn more about pregnancy weeks 1–13.