EWCM days before O?

So, I’ve been noticing. My EWCM is plentiful 4-5 days before O. My OPKs are just starting to get darker and I’ve been cramping for a few days. So I know it’s coming. It’s just now, the CM is drying up ! I feel like my opk will be + tmrw or Sunday based on how they are progressing now. But I literally have zero CM. I’ve also been taking mucinex to help thin it out (it tends to be way too thick) it was absolutely prime CM the past 4 days and we DTD 2 of those 4 days.

Does this happen to anyone else? I plan on using preseed when my opk turns + for that day, day of O and day after. But I just don’t get it. Why it’s so much CM way before my O???

Anyone else?