Two weeks ago i had unprotected sex, i stopped my birth control around 3 months ago but my last injection was over 6 months ago. I haven't had a period yet but i'm still ovulating, not sure what times specifically. I've been bleeding lightly like this for a few days on and off as well as some spotting. I've also had mild cramping but it feels different to what my period cramps normally feel like. Could this be implantation or just my period?