When does 2nd trimester begin?

Question

All my apps say different things. I'm 13 weeks 4 days today. Seems to be when I hit 14 weeks but this app says I'm already in second trimester.

Answer

There are two ways of calculating - by development and by gestation. Development is end of week 12, gestation is end of week 13. This calculator helps: http://www.baby2see.com/trimester_calculator.html

Answer

4 months I believe .

When does 2nd trimester begin?

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