So I had unprotected sex April 30. May 1st I took a Plan B pill. The next couple of days I had unprotected sex again. My period was due Monday May 29. I started bleeding dark red to brownish for a few hours. Stopped and today Iam spotting brown. Could this be an affect from the Plan B or is it Implantation Bleeding? I want to take a test but don't want to waste my time or money! Please help