PCOS? Infertility and ovulation

Hello! I have PCOS and I am having difficulty getting pregnant. We have been trying since last September. I don't have regular periods, maybe two a year...which makes it extremely difficult. I Recently started provera to make me have a period, and clomid to make me ovulate. I finished my last clomid pill 8 days ago (finished my period 12 days ago) and I've been taking ovulation tests that are all coming out negative. Does anyone have advice?