When were you told the second trimester begins?

Baby Mama to #3 • 👼🏻💙1/17/18 🌈👶🏼💖12/30/18 👶🏼💖 9/28/20

So I am seeing a mix of opinions. I was told by my OB-GYN that the second trimester officially starts at 14 weeks. I just want to be in the clear already. 10w5d now. Miscarried at 12 weeks in January.

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