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Normal pregnancy: First trimester

Detail showing development of embryo in uterus at 8th week and fetus at 12th week

The first trimester of pregnancy lasts from the first day of your last menstrual period through week 13.

Current as of: November 9, 2022

Author: Healthwise Staff
Medical Review:
Sarah Marshall MD - Family Medicine
Adam Husney MD - Family Medicine
Kathleen Romito MD - Family Medicine
Kirtly Jones MD - Obstetrics and Gynecology
Heather Quinn MD - Family Medicine

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This information does not replace the advice of a doctor. Healthwise, Incorporated, 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. Learn how we develop our content.

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