Huge bbt dip yesterday?

Hey all, I recently got a bbt ( so I didn’t get to catch my ovulation temp rise, but I also use OPK) and have been religiously temping at 6:30 every morning. Making sure to temp as soon as my eyes open, 3+ hours of continuous sleep.

I got a super low temp yesterday, and this morning back up, and even higher than my previous temps. Anyone have anything look like this? Maybe just a fluke?