When does 2nd trimester start??

Question

Answer

Thats weird that people vote 13? 12 or 14 are common. Technically it's 14. But people mistake for 12 also because 12 weeks = 3 months. But it needs to be 12 weeks from conception which means 14 weeks pregnant.

Answer

I think people say 13 because 40 weeks divided by 3 trimesters is 13.3 weeks each

Answer

I don't know why majority voted 13 it's definitely 14. 
40 weeks gestation divided by 3 trimesters is 13 weeks for each trimester. 
40 weeks - 26 weeks = 14 weeks.
Second trimester starts at 14 weeks, not 13 weeks. Here's a chart that will help.

When does 2nd trimester start??

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