How long is the first trimester during pregnancy?
by 
The Curious Bag
ANSWERS: 1
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Generally, the first trimester of a 40-week pregnancy lasts 13 weeks, with the second trimester beginning in week 14. According to the American Pregnancy Association, the first trimester is when woman and baby undergo the most changes, which is why sickness is common.
Source:
American Pregnancy Association: Fetal Development: First Trimester
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