Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein.
Normal pregnancy: First trimester
The first trimester of pregnancy lasts from the first day of your last menstrual period through week 13.
Current as of: May 1, 2026
Author: WebMD Ignite Staff
Clinical Review Board
All WebMD Ignite education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
This information does not replace the advice of a doctor. WebMD Ignite disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use and Privacy Policy. Learn how we develop our content.
To learn more about WebMD Ignite, visit webmdignite.com.
© 2024-2026 WebMD Ignite.