Why is this happening?

Leah • ✨Leah✨PCOS 👣🌈 Angel baby 12-13-17 👶 Arianna Kaitlin 8-24-09💜 Engaged 💍 Rainbow baby due 11-21-2020 🌈

Why is my BBT spiking so high!? It went up .31 degrees compared to yesterday!