Infertile or nah?

I've been trying to conceive for a few years now, but my period is irregular, and not only will it take 2 or more months to arrive, it lasts from 2 weeks to about a month. I went to the GYN and I don't have any Polycystic ovaries, my system is fine, I just can't seem to conceive at the right moment. I even tried having sex on my wettest day (my cervix was on overload) ...I'm thinking I may be infertile.... any thoughts or suggestions?