BBT drop 10dpo

lb2017

My temps have been odd: 96.8 at first wake up and then shooting up to 97.58-97.9 within an hour (still in bed). Most days it stays high or climbs higher.

Today, no matter when, it’s 96.35-97.33 at the highest.

Why would it plummet at 10dpo? All my other charted symptoms pointed to ovulation, including a positive opk- so I went with the higher temps each day before getting up.

Anybody have insight?