BBT novice question-dip then spike

B

Hello!

Wondering if anyone can help me understand BBT. This is the first cycle I’m trying it. My temp was steady- around the same not exactly- until I ovulated (indicated by OPk). Then it went slightly up. Not drastic but a small jump. After three days of the exact same high temp, it dropped back to pre ovulation numbers for one day (yesterday). Then today it’s way up. Highest it’s ever been. What does this mean!?

Backstory- I suspect I may have low progesterone due to a short luteal phase. I have never had more than 10 days in the luteal phase so I was temping because I was told if it drops before my period that means low progesterone. I was actually anticipating my period to start yesterday or today with that drop in temp but now it’s back up!?

I was pretty positive I was out this month but now I’m confused and still hoping.

Thanks!