AF started but haven’t ovulated?

Hi all

My partner and I are TTC, I have a diagnosis of PCOS and endometriosis. My cycles vary from 24-54 days (in the last 4 months) and this month I’ve been using OPK’s to try and determine the best time to BD. I haven’t yet ovulated but wasn’t too concerned because I’m only on CD25. This morning AF has made an appearance or at least I think it’s AF, heavy enough to be. Has anyone experienced this that can offer me any advice? I’m considering speaking to my GP to see if they can give me blood tests to determine if I am actually ovulating (is there even such a thing?). We have been TTC for 3 months and been advised by the GP to see him if no success after 12 months given my diagnosis.

Thanks 🙂