I have been on the pill for eight years now. I usually stop bleeding within a day of finishing the sugar pills, but this past time I am still bleeding three days later. It is not heavy, but it is heavier than it should be. I also experienced some cramping last night. The past two months my period was very light and only lasted two days while this one was heavier. I was also on antibiotics about a month ago. I have also been experiencing some aching in my left lower abdomen since the antibiotics. If I am still bleeding two days from now I am calling my doctor. What could be wrong with me??