16 and Paranoid!!

Okay I know you can't get pregnant from oral but me and bf did it like last week. We only did fingers. And before that I gave him a hj so when he was zipping up his pants he said he wasn't sure if he touched his sperm or not. But then he gave me oral after he was done. My period is now late and I have been eating like crazy and gaining weight. But also I do that usually. I haven't taken a test yet and I'm just really scared. Please someone tell me if this a possibility or not?