No my period are same length every month x 4 days
So this doesn't sound very PCOS. Regular ovulation and periods, is kinda strange to anyone with PCOS. (In my experience of hearing about it.) Have you checked your vitamin levels? I've heard that there's some corolation with fixing that and being able to conceive. Dr Shultz has some excellent quality and potent herbal concoctions. He sells kits for detoxing various organs. But I'm not an expert on fertility, and it feels awkward trying to suggest things that might help. My ideas are a long shot. You should consider either researching for podcasts or books from fertility doctors. Or seeing one yourself, and see what they recommend. I didn't think to ask how old are you! That also affects everything. Because apparently lower 20s are a peak fertile window. (Listened to a fertility doctor on the dairy of a CEO.)
How often are you having sex? Since you commented here, do you have PCOS? I'm guessing if so, are your periods regularly moving around in length?