First trimester: What's happening

This section covers the physical and emotional changes you can expect during the first trimester of pregnancy.

  • Find out what's happening to you and your baby.
  • Learn what you need to know to make good choices for both of you. 
Illustration of pregnant body in first trimester

During the first 13 weeks of pregnancy, you barely look pregnant on the outside. On the inside, things are profoundly different.

Source: Allina Health's Patient Education Department, Beginnings: Pregnancy, Birth and Beyond, seventh edition, ob-ah-90026
First Published: 10/04/2002
Last Reviewed: 12/02/2015

Radiance to rashes: How pregnancy affects your skin - teaser