Me and my boyfriend had a unprotected sex last last week and then I took Emergency contraceptive pill.. and now this week we had unprotected sex again and during sex I noticed a pink / light pink discharge and I ask him if he cum inside me.. he said yes so now i planned to take emergency pill again but I got my period this morning.. its a heavy period.. but im also thinking that it might be implantation bleeding.. Do I need to take emergency pill? Is this really a menstrual period? Or implantation bleeding?