Throwing up

Okay so Last night I threw up twice and I am starting to worry about it cos I feel no other symptoms other than me throwing up last night. I think it's because I ate a pizza last night but I usually get a 10" and that almost fills me but I got a 12" and that made me really full and after finishing almost all of it i felt slightly sick. But I thought I was going to be fine. I also might have a touch of gluten intolerance.

So my question is is this normal? I constantly worry about pregnancy even though I am on the pill, me and my boyfriend haven't had sex yet and just to little things like touch each other and stuff but it's things like his semen some how getting through my cloths or me touching him and forgetting to wash my hands then hours later my hands making contact one way or another with my vagina. I know that I can't get pregnant but can someone please just reassure me that it was because of the pizza probably