There is always the possibility of getting pregnant after having sex either with or without protection or pulling out. If you are not able to go to the store to by a pregnancy test then you could always go to your local health department and they can give you a test. You might even want to wait until your next period being that you did have one this time. I personally wouldn't worry until I actually skipped a period or it was just spotty. But if you want to be completely sure then you should take a test or go to the dr.
Sorry to tell you, but it could be possible that you are pregnant. Even if he pulls out, some of his sperm (from precum) can still create pregnancy. If you can't go to a store and purchase a pregnancy test, maybe ask a friend? Or just go to the doctor. I would also recommend that if you don't want to get pregnant and are sexually active you should really use some protection; condoms, birth control, or both would be best. Not only is there the risk of pregnancy, but also STDs. Be safe, and good luck!