I was on the birth control pill for about 2 1/2 years, but my doctor's office was late calling it in, so last month I was not on it. Had sex using pull out method. Thought my period came last Sunday, but have only had a brown discharge with very tiny clots occasionally, lasting a week and a day now. I did start taking the pill again last Sunday when I first spotted blood, but my period has been so light, what could this be?