1st & 2nd trimester confusion. when does 2nd start?

Kayla
When did everyone else consider the start of their 2nd trimester? This glow app says 12 weeks was the end of the 1st trimester and now it's telling me the 14th week was the end of first trimester... I went by 13 weeks as the start of my second trimester. What about you guys? 

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