The chances are low, but still could result in pregnancy. The day your next period is due, you could take a home pregnancy test to be sure.
its possible even if not highly likely - even if he didnt finish inside you he can still have some pre-ejactulation that comes out before his full load. I had a friend who got pregnant that way summer after her freshman year of high school. Even if you think the pull out method works - sometimes it doesnt work all the way. - Whether you end up pregnant or not, just remember things will turn out ok one way or the other!