Can a girl have her regular period and be pregnant?

Patient: If i get a NORMAL period on its regular time and assume I am not pregnant 100%? It s eating my mind and I am worried! I have no symptomsI had intercourse (no ejaculation occured) 11 days before my period. I’ve had no strange symptoms or anything and I got my period on its time (probably a day late).The period looks normal and I sound paranoid but I’ve heard stories where women don’t know they’re pregnant until 3 months and I wouldn’t want that to happen.Please help? Can I rest easy knowing I am def not pregnant?

Symptoms: Severe cramps, abdominal pain, regular PMS symtoms