HELP!!

Patient: I had an abortion on Feb.3,2011 and I have yet to get my period. It has been almost 8 weeks since I had that done. Right now I am having slight abdominal pain for the last 2 days. It feels like cramps but I have yet to see anything. Also, my OB GYN prescribed me birth control that he, but he told me that I have to wait until my period to comes on before I can began them. Please help, should my period be coming on soon.

Doctor: