Apple Watch Track BBT???

Layla • Mammy to Sophia, who was 2 in June 💕 had a mmc end of Nov 18 😢, Pregnant with 🌈 👶🏼 💙 .. 👨‍👩‍👧 + 🌈👶🏼💙 EDD 12/11/19 🤞🏼💕

Hey Ladies, has anyone heard of or used this app along side Apple Watch to track BBT successfully?

I was planning on getting a new Fitbit and bbt tracker but stumbled across this???

Anyone???