BBT dropping at 6 dpo

mamaof3

I’m 6dpo today (confirmed by opk), but my temps are now dropping below my cover line. I’ve never had this happen. They usually rise and stay elevated until my period. Sleeping conditions same as usual, etc.

Too soon to test obviously, but just seems off. I’ve gone through all of the testing and I ovulate regularly. Just confused and frustrated. Back to trying after losing our twins in February. Cycles have been normal.