Why does my bbt do this ?

Tempest • TTC #2 after 15 years...👨🏽‍🦱 ... 🤰🏽 ❓👶🏽

Why does it show such drastic changes.i do it the same time every morning..I even set an alarm to wake up to do it.

The only thing I can think is because I sleep with an AC and a fan..but the AC and fan is set to the same. So I don't know.