Ovulating immediately after AF?

I haven't taken a OPK since July. I've kinda put TTC on the back burner since I'm in a waiting period to find out if I have PCOS or not. My question stems from me discovering egg white CM more often after AF. My last CD was 10/16 & this morning I woke up to pee & noticed really thick CM that was hard to break. Normally u aren't supposed see that until ovulation which can be 10-20 days from ur last CD right? It's really confusing. Has anyone else noticed this?