Well there is always the chance she isn't pregnant, I can't tell you how many times my girlfriends been irregular. After so many pregnancy scares, you learn to wait and see what happens, see if she wants an abortion. If she does find a way to pay for it and go ASAP. She's 16 or so, scared, and feeling the same way you are, chances are she will get it. Be kind and considerate of her feelings too, you are definitely not alone.
No matter what happens life goes on, your not the first person this has happened to. Be more careful next time.