Confusing Bbt chart

I want to preface by saying that I just got a bbt thermometer after my PK tests peaked on the 1st. The bbt thermometer came in the mail like around the 8th or 9th. So this chart may not be 100% accurate however, I would love to hear everyone’s thoughts on when you think I ovulated, because I am so confused by all the ups and downs I peaked via opk on the 1st but then it dipped again. I’m about to get the AVA bracelet to see if that helps me pinpoint the temperature shift. Next month I will also be able to use my new bbt thermometer all month long. Af due tomorrow. :-/ All negs so far.

How do I tell when it is indeed my ovulation time via bbt?