Pregnant?

I know people get mad when a girl thinks she is pregnant when the girl hasn’t had sex. But I’m scared. I have had sex sex. But we did oral and he fingered me. My periods never been late in my life until now. He never ejaculated. I just need advice. Is there a reason that my period isn’t coming that I don’t know about or understand? I’m not trying to sound stupid, I’m just confused. Please help