Hey, I think it can be helpful more towards when your period is due, if bbt stays high then it can indicate a pregnancy and if it comes down then it could mean AF is on its way as the progesterone wears off. Up to you though I’ve had some months where my temp has still been high and I had AF that day and some months where there was a drop a day or 2 beforeDoes bbt temping help when you’re in the tww?