Pregly has made me a confused mother to be :/
So I thought I was in my first trimester still I am 12weeks I think... but pregly stat forum says I am in my 13th but 12 the week and second trimester... does anybody want to explain it I'm confused please and thank you

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You've completed 12 weeks of your pregnancy, so you can say you are 12 weeks pregnant. you are now working on your 13th week.
So yes, you are in your 2nd trimester.... Congrats