Where are you now?
Pregnancy week by week
The Office on Women's Health (OWH) describes pregnancy in three trimesters: weeks 1 to 12, 13 to 28 and 29 to 40.[1]
Healthy pregnancy
Getting ready for birth
Safety and support
CDC lists urgent warning signs to watch for during pregnancy and in the year after birth.[2]
The National Institute of Mental Health (NIMH) says perinatal depression can happen during pregnancy and after birth.[3]
After birth and the early years
CDC publishes milestone checklists from 2 months to 5 years, and says most children (75% or more) can do the listed skills by that age.[4]
How this guide works
Every fact names its source, such as the CDC, NIH, WHO or Brazil's Ministry of Health, and links to it.
Each page shows when it was last reviewed and when it will be reviewed next.
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- How do I get pregnant? When you ovulate, fertile days, folic acid and getting healthy first
- Am I pregnant? What do I do first? Early signs, the pregnancy test, the first prenatal visit and coverage
- What happens in the first trimester? Pregnancy weeks 1 to 12, week by week
- What happens in the second trimester? Pregnancy weeks 13 to 28, week by week
- What happens in the third trimester? Pregnancy weeks 29 to 42, week by week
- What tests do I need during pregnancy? Prenatal tests by week, screening, the anatomy scan and the glucose test
- What can I eat while pregnant? Food safety, fish, caffeine, weight, exercise, sleep and work
- Is this normal in pregnancy? Warning signs, bleeding, morning sickness and common symptoms
- Baby blues or postpartum depression? Feelings in pregnancy and after birth, and where to get help
- What should I pack in my hospital bag? Getting ready for birth, signs of labor and C-section recovery
- What comes after birth? A checklist from pregnancy to kindergarten
Free from UpOnly Learning. Written for families of every faith. No outside ads and no affiliate links. Every fact on this page comes from the sources listed below. How we source and review these pages
Updated 2026-10-24: first published.
Sources
All sources were opened and checked on the date shown.
- Office on Women's Health (HHS). Stages of pregnancy. Checked October 24, 2026.
- Centers for Disease Control and Prevention (HEAR HER campaign). Urgent Maternal Warning Signs and Symptoms. Checked October 24, 2026.
- National Institute of Mental Health (NIH). Perinatal Depression. Checked October 24, 2026.
- Centers for Disease Control and Prevention. CDC's Developmental Milestones. Checked October 24, 2026.