I don't have PCOS, but I have extremely irregular cycles. With DS, I believe I was on CD 58 or something crazy like that, and with this one, I was past CD 30.
I can't take a valid temp worth anything, so I tracked CM and cervical position. It was the combination of the two that confirmed ovulation for me. Checking position is kind of awkward, but you get over it. At first, it was hard to tell the position since I didn't know what I was supposed to feel, but it is obvious when it changes.
I got pregnant on the first try (meaning the "Hey DH - I'm ovulating. Get over here" tries) both times. I know that's not typical, and I was shocked myself.
With DS, I didn't test until Christmas Day (so about 21 days DPO). With this one, I got my BFP 13 days DPO (going by my chart, not by my dating ultrasound).
ETA - I just saw that you posted this on another board. In reference to the comment about geting fertile quality CM multiple times during your cycle, that post is absolutely correct. That's why I started checking cervical position - a low, open cervix indicates ovulation.