When does your BBT usually go down before AF?

Question

I am 11 dpo. 
& My bbt is still up so I’m hoping that’s a good sign but then again I’m not getting my hopes up at all.
When did your bbt usually start dipping before AF ?

Answer

Here’s mine from the cycle i ￼ conceived.

Answer

I've had my temp drop 2 or 3 days before (slow decline), I've had it drop suddenly the day before, and it's also dropped suddenly the day of AF too. It can vary

When does your BBT usually go down before AF?

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