Pregnant with inconsistent AF?

I have been trying to get pregnant for 3 years naturally. If lucky I was able to get my period 2 - 3 times a year and it was always light. So basically I never get it and never know when it might come. I have pretty recently been put on provera and clomid and I'm just curious to see if anybody else out there who very rarely got AF on their own was able to get pregnant by taking provera and clomid? I'm just beginning to feel like I'm never going to fall pregnant :(