Ten day Pro vera Pill

Ive been taking my medroxyprogesterone (Provera) pill for the past year and my periods still don't seem to regulate. I've only been able to have a natural (not taking medicine) period on my own only 1 time and that was when I was 22. I'm 25 now and I'm catching that baby fever but I feel like I'm at a standstill. My husband is 31 and wants to start a family and he understands that there may be a possibility that I can't have one and it's just hard. I don't know what to do. Do I ask my doctor to change my medication and give me something that's going to help me ovulate and help me get pregnant? I'm taking the proper steps on managing my weight and health. Ideally I would like to lose at least 50 pounds before I try to have a baby but is it to early to talk with my doctor?