I had an abortion in May, but I have not gotten my period again since. The last few months when it should be time for my period, I have been getting REALLY bad lower abdominal pains. Not like regular menstrual cramps. Last month I went to the hospital because I thought it was my appendix. They tested for STDs, pregnancy and even did a sonogram. The only thing they could find was a slight bladder infection. After 10 days on antibiotics I was feeling much better, but this month the same thing happened. It is time for my period, but it's a no show, and instead I have these horrible abdominal pains. What else could be the cause?