Suggest Remedy For Missed Periods,tiredness And Sharp Pain In Breast

Hi my name is khristen i'm 4months late and not even had any spotting. i have done HPT, blood test and all came back negative. with my first baby i never find out till i was 7months pregnant cause the HPT was reading neg. so anyways she is 8months now and i only had 3 periods since i gave birth. my last period was 7-29-10 till 8-01-10 i've never had it that short before. my doc told me to take provera for 10 days then i seen all the side effects online and i said NO WAY!!! so i don't know what to do can you help me please??? the only thing i get is im very tired some time sharp pain in my breast. please help!!!!