When does the third trimester start?

Spring Momma πŸžπŸπŸ’πŸŒΏ β€’ 31| Married πŸ’ SAHM of two πŸ‘§πŸ»πŸ’• πŸ‘ΆπŸ»πŸ’™

Glow says 26 weeks, Ovia says 28 weeks and baby center says 27 weeks πŸ˜¬πŸ€”