Third trimester?

Caitlyn • Married 💍 Mommy of 4 year old boy and 6 month old baby boy💙💙 fur baby yellow male lab 🐶 love all my Berry boys!

Ok ladies what week is the third trimester? All the charts/graphs online say that 27 weeks is but I see everyone posting pictures at 28 weeks for the third trimester. Just curious as to when I can finally say I'm in the third trimester! Lol 26+4 today 💙