THIRD TRIMESTER?

Alexis • Mama to a little boy & baby girl ❤️
Almost every single thing I've read considers 27 weeks your third trimester since it's the beginning of your 7th month, but glow says 26 weeks is the beginning of your third, and then some people will say 28 weeks is? WHAT IS THE RIGHT ANSWER !!!!!!
I'm 27 weeks this Wednesday and want to know if that's my official third trimester or what!!!!! 

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