I'm scared PLEASE HELP

My period is late by 3 days. I've been getting nauseous and crampy. My stomach feels bloated, like I'm full of water. Is this a sign of pregnancy? My boyfriend and I did things about two weeks back with protection and about a week ago with and without. He didn't cum inside me but I'm scared that maybe the condom leaked or something. Am I just overreacting or could I be pregnant?