Could I really be pregnant or am I worrying over nothing?

Hey everybody...I've been reading a lot of stuff and it might be just making me paranoid but I'm super scared. I'm a 18 year old girl and I ended up getting really drunk at a college party and making a huge mistake, giving my first to a guy i barely knew. We fooled around a lot and I ended up giving him head before doing anything more, it didn't make him cum and he kept slamming my head down and I couldn't breath so I made him stop before he cummed. We ended up making out a bit more before he tried to stick his head into me. I decided that it was bad and immediately got him out of me. He ended up finally cumming on my bed after kissing more, nothing got inside of me. Although the night is hazy, I remember this part because after he left my bed was wet and I covered the spot with a sheet because I didn't like how it felt. After that I went to sleep. I didn't take plan b because I didn't think I could be pregnant but I usually get my period around the 22 or so, and I've had nothing...not even my normal symptoms. I'm so scared since my parents would kill me and I can't raise a child since all my money is keeping me in college. Could I really be pregnant or am I worrying over nothing?? Please help me!!