Last updated: December 5, 2024

Tests, appointments, physical changes – a lot happens during the first trimester of pregnancy. Find information that can help you through those first important months.

Your first trimester lasts from week 1 to end of week 14:

• Normal pregnancy: First trimester

Babies grow quickly during the first trimester. Learn about the two stages of development and how your baby’s growth will progress:

• Embryo and fetal development in the first trimester
• Fetal development at 12 weeks of pregnancy
• Fetal development at 8 weeks of pregnancy
• Week 8 of pregnancy: What's going on inside
• Week 12 of pregnancy: What's going on inside

Having regular prenatal care is important while you are pregnant. Early in your pregnancy, you can expect to visit your doctor or midwife every four to six weeks.

• Check-ups and tests in the first trimester

You may feel tired, gain weight or have mood changes during the first trimester. This is normal. Learn more about other changes to expect:

• Mothers' physical changes in the first trimester
• Pregnancy weight gain in the first trimester
• Pregnancy: Dealing with morning sickness