What week begins your 2nd Trimester?

MrsJohnson • Married💍 RN🏥 Expecting Baby Johnson September 19✨
I've read about it on several websites and many say week 13 and many say week 14. I'll probably ask my doctor Tuesday but I hit 12 weeks today and wanted to announce when I entered the 2nd. Just wanted to know you guys thoughts. 😊

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