I Don't Kno If I'm Pregnant. But I'm Really Scared.

I don't kno if I'm pregnant. But I'm really scared. I can't turn to my mom for help. She'll be really mad. Is there anyway to prevent pregnancy? I don't take birth control my mom won't let me. I've had sex before and it was unprotected and never got pregnant. He pulled out. I'm not sure if he pulled out before he precummed tho. Me and him are both really scared cause we have no way of buying birth control... Please give me advice... I'm really scared...