possible unwanted pregnancy??

hi guys so i had sex with my boyfriend about a week ago and since we didn't have protection we literally did if for like five strokes. like it probably only lasted for less than ten seconds. he didn't cum and he said he had peed after the last time jacking off. i'm paranoid that i'm pregnant. i was supposed to get my period yesterday but i haven't yet although my periods are slightly irregular. i know that anytime you have unprotected sex there's a chance of pregnancy but i just need some reassurance! opinions??