Scared !! 😭

So me and this guy that I used to talk to . I really liked him and we've had sex twice the first time I didn't let him finish because inwas scared that he didn't have a condom and I'm only 15 ! But after that I said the next time I see him we will do things and have sex so he picked me up and we started making out and all this and we started taking each others clothes and and he had sex and like he pulled out and cummed on my stomach but I'm scared he pulled out late and I'm scared I might be pregnant it was about two weeks ago and a couple days ago me and my friend ate exactly the same food and I was the only one that got sick I threw up and I was feeling really dizzy . And I told my sister that I haven't been feeling good and the first thing she thought of was pregnancy . But it couldn't be right cause my stomach isn't hard nor I don't feel sick anymore . So am I just paranoid ?? Please help 😭😭😭😭😭