Fallback rise?!

Has anyone had a fallback rise bbt the day after ovulation? This is my first month that I’ve noticed it.

I had a slight dip the day before I assume I ovulated. Temp was 36 c. Next day temp went up to 36.4c. This morning temp was back down to 36c. Waiting to see if tomorrow it rises again.

I’m pretty sure I ovulated though bc my cervical mucus was extremely fertile and I had a ton the few days before.