About a month ago I started on birth control pills and half way through I experienced spotting. Worried that I might be pregnant I took a test and it came up negative. Later I started to experience bleeding while still taking the pill, I thought it was my period. I experienced sever abdominal pain and bleeding. Then later what seemed to be some type of bodily tissue then was released out through my vagina. The pain has now gone away. I was scared though because I had never experienced this, and wondering if I should see a doctor.