Confused 🙄

So i had unprotected sex a month ago and i was suppossed to start my period that same month on october 15th but i didnt. I then decided to take two pregnancy test the last two weeks of october nd they bith came out negative Then on november 7th i didnt know if it was my period or what ?.. It only lasted for three days and it was really light nd not heavy at all, my actual period was suppossed to start on November 15th . I'm so confused about this i dont know if i'm pregnant or if my period was just late ? .. HELP PLEASE .