Implantation bleeding?

Okaay so i had my period already at the beginning of this month. And i had sex on the 22nd. On friday the 27th i got cramps and when i checked my underwear there wasa brown stain and when i wipe my vagina there was blood. It was thick and had brown stuff as if it was my period. It lasted this morning bcus it lightened up to just light brown discharge. But the first couple of days it was heavy like my period. Is this implantation bleeding or my period of the second time?