I had sex with my fiancé while I was on the third day of my period (you might think it's gross and that's fine). I kept bleeding normally then a day later it stopped how it normally does when I get off my period. Well today I'm spotting and it's brownish pink and it's light. Is it possible it could be implantation bleeding or is it just my period being mean? Im having mild cramps also. I usually have normal cycles but these past couple ones have been off. Any help would be appreciated!