I think im fine . . .

Okay so like two days ago i had sex with this guy and like after i got up from being on top of him i looked down and like there was cum and so im like did you cum in me and he said he didnt but like i kinda believe him and i mean like i didnt feel him cum in me . . If you can even feel that i dont really know but then later we buy a plan b just incase you know and like i took it 1- 1 hour and 30 minutes later so i should he fine right ? Like it worked ? I shouldnt he pregnant. I read up all on it but im just paranoid because im only 16 and i cannot live the lifestyle if a parent right now.