Possibly, if you're ovulating.
It doesn't matter how deep he goes inside. You have to remember that sperm have specifically evolved to be aggressive swimmers and to locate the target (egg) at all costs in order to perpetuate the species (http://www.livescience.com/794-sniff-swim-sperm-find-eggs.html). They can actually swim through even a little river of sweat outside your body, so swimming an extra inch or two inside you is nothing. Also, many guys involuntarily ejaculate a little semen before orgasm (without even noticing), so pulling out and not going in deeply have to be the SILLIEST (as in absolutely least effective) birth control methods on record.
You've got to use protection, not only for the sake of pregnancy prevention, but also for std protection. Since you didn't mention it---and you think not going in deeply or pulling out are even good ideas---I'm guessing that you didn't.
Honestly, the lack of understanding you demonstrated tells me you're too young to be doing what you're doing in the first place. I'd say stop and talk to your parents.
My guess is you're not going to do that so... If you are going to be sexually active then you MUST have a more sophisticated understanding of birth control; that's not optional! You can't be irresponsible or ignorant about this. Educate yourself:
I don't mean to come down on you; I'm trying to get you to understand that this is extremely serious and it sounds like you don't know what you're doing and are not being smart about something that is potentially life-altering.
To deal with your current mishap, if you want, you could look into emergency contraception ASAP. It's not an abortion pill, so if you're already pregnant it will have no effect. If there are microscopic sperm still swimming around on the way to the target, this could help:
(Oh, and don't buy into the "douche afterwards" myth. That just makes things easier for any sperm that aren't washed out.)
Answered Apr 18, 2011
Edited Apr 19, 2011