I am on Provera, and need help?!!!?

I was diagnosed with poly cystic ovarian syndrome, I hadn't had my period for about 8 months I was put on Provera 10mg. for 7 days and then I got my period two days later. Now 1 month went by and I didn't get my period and a negative pregnancy test. So, I was put on Provera 10mg. for 7 days same as the first time, but know 7 days have gone by and there is no period, I don't know what is going on why haven't I gotten my period. I am trying to get pregnant. Can you get pregnant wild you are taking Provera? I have been felling a little weird.... Can someone please help me.