Bbt chart! help!

Katelyn • Wife 💍 Fur momma 🐶 🌈 due March 2018! ❤️❤️
This is my first month temping & im so confused. Is that an ovulation spike if so when did I ovulate?! I'm only CD 12 😐 I got this opk this morning also! Thank you if you help & baby dust!!! ❤️❤️