I’m so paranoid

4 days ago, I lost my virginity. We didn’t use protection and my parents know. The thing is that my dad asked me if I was pregnant and I can’t get that out of my head. He didn’t even finish because I stoped the whole situation because it was hurting a lot but during those days I was in a medium chance of getting pregnant. My period is supposed to start in 6 days but is really irregular. I don’t even know but I’m so stress and paranoid maybe because it was my first time.