My boyfriend and I had sex on the last day of my period, basically, and afterwards we discovered that the condom broke. This was about 1 am on a sunday morning and i took Plan B at about 7 pm on monday. The following saturday, I began spotting. However, it was more than just a "spot" it was more of a light period. However, I JUST get off my cycle about 7 days prior, so I know it wasn't my period; it was either effects of Plan B or implantation spotting. I know that Plan B causes spotting, but it is hard to tell if the spotting is from Plan B or if it is implantation bleeding? How long would the spotting from Plan B last as opposed to the spotting from implanation? Would the amount or color of blood help deteremine?? PLEASE HELP!! Any advice would be appreciated!!