The first trimester completes by
Historically, the first trimester extends through completion of 14 weeks, the second through 28 weeks, and the third includes the 29th through 42nd weeks of pregnancy. Thus, there are three periods of 14 weeks each. (Ref: William's Obstetrics; 25th edition)
12 completed weeks
13 completed weeks
14 completed weeks
16 completed weeks
All India exam