I had an iud in for 7 months. After 1day I started to see dark blood then the following day I got my period or just bleeding. It lasted for about 9 days 3 days after I had sex with protection but I bled right after that for 3or 4 more days. 5 days after I had sex without protection we had protection there but in the heat of the moment. I purchased and used the plan b the same morning and haven't done anything since because im waiting for my cycle. But then again it might be off because of my iud and the pill. It came the 29 of March going into April so I dont know. Please help.