Is 27 weeks third trimester?

Alisha • Caleb 21/03/2018 3:40am weighing 5lb 13oz! 🙊👶🏻 💙 Lylah Rose 19/12/2021 7.08am weighing 6lb 13oz 👶🏼💖

I am 27 weeks tomorrow does that mean I’m in the third trimester?😊