@Cris12311,
It is not impossible.
Unprotected sex is also a dandy way to pass STDs back and forth.
Buy a home pregnancy test if you're concerned and
follow the directions on the box. And while you're in that section of the drug store, pick up a pack of condoms.
If you are old enough to do the deed, you are old enough to be responsible for your actions. I take it you'd rather not become parents, so take some action to prevent that from happening and don't just let the chips fall where they may.