I had irregular periods. My doctor prescribed Me regestrone for three days. I got my period. During that time I was also given some antibiotics like microdox lbx. My period started on 12th and ended on 18th but I have been having continuous spotting till now (24th). The blood is brownish (kind of like the blood at the end of a period cycle). So far it had been very little but today I experienced a heavier discharge of dark, sludgy blood. My reports show that I didn't have either viral, parasite or fungal infections. Basically infection was "sterile" according to my doctor and therefore she decided to put me on broad spectrum antibiotics. Why am I experiencing this bleeding? How can I stop it? Is this dangerous? My doctor will not give me clear answers over the phone and I'm traveling. Please help me.