I wouldn't worry about it - even the most excited guy won't ejaculate in 15 seconds!! :-)
you had penetration so yes there is a chance
there is absolutely no chance u r pregnant u dont need to worry.
I think that being that your intercourse only lasted 10 to 15 seconds, your chance of getting pregnant is slim to none. Especially being that he did not c** inside you. I would not worry about being pregnant. If you happen to miss your next period, then I would take a hpt, but I don't think you have anything to worry about!
i think there is very very low chances of you to get pregnant, but wait for your due date of your periods and take home pregnancy test.and i personally think there no chance . Good luck