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Normal pregnancy: First trimester

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: July 10, 2023

Author: Healthwise Staff
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All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.