I had unprotected sex April 30th. Took a plan b May 1st. Started my period the same day. I only bled for two days. Then had unprotected sex a couple more times right after. My bf pulled out but I have gotten pregnant twice before by him from pulling out. My period came May 29th. But I was bleeding dark red and brownish just for the day. Iam having really bad back aches, headaches, really tired, moody, and nauseous. Could this be an affect from the Plan B or is this Implanatation bleeding?