Pulling out has the highest failure rate. It's very possible you could be pregnant. If you can't use birth control, at the very least you should be using condoms. No excuses if you're trying to avoid pregnancy.
Hey, it would probably be too early to test, so wait and see if your period comes when it's due. If you're not wanting to get pregnant, please, please, please start using some kind of proper birth control, there are many different kinds available. "Pulling out" is NOT a form of contraception! Take-care, I hope you get the outcome you want :-).