When does the 3rd trimester start? I keep reading different things

Question

Answer

The American Academy of Obstetrics and Gynecology define the third trimester as starting at 28 weeks. They are who I trust, not these apps, as they are staffed by medical specialists in this field. I am 28 weeks tomorrow, yay!

Answer

According to glow im now in my 3rd trimester at 26 weeks.  That's what I'm going by.

Answer

I've been seeing different things too. I'm 27 weeks but not sure if that's my third trimester yet or not.

When does the 3rd trimester start? I keep reading different things

The Top Baby Tracker App: Embrace New Beginnings with Tender Care

The Top Fertility Tracker App: Your Path to Achieving Pregnancy

The Top Pregnancy App: Nurturing Your Journey to Motherhood

The Top Period Tracker for Empowering Your Menstrual Health Journey