CM changes?

12 DPO BFN yesterday AF still has not arrived (due today). Having abnormal amounts of CM in my 2ww. I know it's not the most accurate way of telling, but have you noticed changes in amount/type before BFP? I'm regular down to the hour and the fact that it's mid afternoon with no af I'm suspicious. I plan to test again in am but I don't want to get my hopes up too high...ttc 13mo 😟