advice

so i’m actually young and i’m sexually active and i didn’t know if it’s normal to have a period for a day & then not get it anymore i usually get my period from 4-5 days but i’m supposed to start my new period in a few days and i’ve been having cramps so i’m hoping i get it . but i looked up what it ment if you got your period for a day and it said my body had token the sperm and it had attached. any advice?😕