So from the very beginning of this cycle my confirmed ovulation date on FF did not line up with my OPKs or my CM. Glow and Premom both said that I ovulated on CD14, but despite having identical data, FF said I ovulated CD13. It absolutely refused to sync up with Glow and Premom. Today, at 8DPO (would have been 9DPO according to FF) after I entered my BBT it gave me this message and change my ovulation date to be in sync with Glow and Premom.

I know these apps will take data and adjust their predictions as your cycle goes along. I removed today’s BBT from FF and it reverted ovulation back to CD13, so today’s temperature is what initiated the change. I re-entered today’s temp and it moved ovulation day to CD14 again.

My question is, at 8DPO why does my temperature all of a sudden trigger this change in ovulation date? Arwmt I far enough removed from ovulation that today’s temp shouldn’t affect the prediction?