Irregular Cycle and TTC

Erin
I've been TTC for about 7 months now, and I have been very unsuccessful! I have been diagnosed with PCOS since I was 13, with super super irregular periods. I'm unsure if I have cysts or not, I've never been tested for them. It's never been a problem, until now. I have been using opk's for the last month, since the last time I got my period, and not once has it come up positive! What is going on?! I haven't been stressed about it until now, it's just starting to bother me a lot more. Do any of you ladies have any suggestions to start it, or increase it? Thanks!