Unfortunately, medical abortion can lead to infections.
Surgical abortion is better because the doctor cleans the area and sterilizes the vagina before surgery, so less infection risk.
ONE thing I can think of, and the woman was similar to you... She had undiagnosed Chlamydia, an STD...
It caused a massive infection inside if her, which is does do from time to time.
Because you had lots of antibiotics it would not be there most likely.... Could that be possible? An std or other bacterial infection?