U can look this up: But 26 2/3 weeks, each trimester is 13 1/3 weeks as 13 1/3 x 3 trimesters equals 40 weeks and a piece of advise do not let your preg go past your due date the ideal time to deliver according to a recent very large study is 39-40 weeks , I do not let any of my pts go past 40 weeks !
Answered 5/17/2015
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