Taking Provera

Hello..I just moved in new place from home town and I found one missed period and then abnormal uterine bleeding for 1 month.I went to Doctor she put me on Provera 10mg for 10days for 3 cycles and Diagnosed me PCOS..But I'm shocked I have regular periods every time how I can suddenly got PCOS.First month I took my Provera pill for 10days and after 2days I got my periods (they are heavy)and second month I thought I'm not going to take it and as result no periods that month..Then again next 2months I took my pills for 10days and as told I got my periods after 2days..From starting of this treatment we are Not TTC ..but from last cycles we Are TTC by doing our work on FW but results are negative every time .In between these months I done ultrasound which shows I'm ovulating My own..during this month I didn't take my Provera pills.I got BFN on 9dpo...I'm very nervous right now....I want BFP very badly...God help me