Confused

Faith
So I see all these pictures on the weeks and months. I'm 27 weeks. Glow says I'm in my 3rd trimester and I'm 7 months. What do you guys think? Btw I believe the 3rd trimester is correct bc it goes by 3s. I.e - 1-3 months is 1st, 4-6 is 2nd and 7-9 is 3rd