Implantation Bleeding

Betty

Ok, so here goes, me n my DH aren't really trying or really preventing except the pull out method but we did have sex twice in my fertile window around the 2nd and 3rd of October so my period isn't due for another 8 or 9 days so today when I went pee there was some dark blood when I wiped. Is there a chance that was implantation bleeding or just my body messing up again? any stories or advice would b greatly appreciated. tia