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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