Frustrating

Well.... I went to see my OBGYN and he says I have not lost my ability to have more babies. Thing is I only had 1 period since my stillborn in January. I had my postpartum bleeding from 1/28/17 to 2/28/17. I had my period 05/06/17 and no more since. I found out I'm not pregnant. Now I have been on provera for 9 days and no period! I'm so lost. Why haven't I had my period?? I also have PCOS.