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!
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.