Help plzzz!!!!

period ended a week ago this morning i woke up and i was bledding! I've been cramping i feel so tired and weak??? Is it normal to be spotting. I've been sexually active on the first days on my Period and he ejaculate inside me . Is it possible to get pregnant even if you have sex with your period???? Also yesterday  i was  nauseous & crampingWhat to do??? maybe im getting Sick 😔😳😬😩