Medroxyprogesterone jumpstart cycles?

Ever since I stopped birth control in January my cycles have been super long. The shortest was 42 days and the longest was 90. I'm ttc so I want to ovulate more regularly and be able to predict my cycles better. I'm already tracking bbt and using OPKs etc. So my doctor told me to lose weight and gave me medroxyprogesterone to force periods. He also gave me Metmorfin. My question is. Has anybody had success with their cycles going back to normal after using Medroxyprogesterone? How did it help you? Did you have to keep taking it or did you stay regular afterwards?