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That varies per person and sometimes per cycle. Ive had cycles where the temp drops then af comes the next day, also had cycles where temp drops and af comes that day...and one cycle where af came then temps went down the following days. Theres no definite answer for that, sorry.

Mine dropped today, still above cover line though, but af not due til this weekend

It can drop a couple of days before AF too. I have had that happen.

my temperature always droped on the same day of Af.