Um worried af

So I and unprotected sex with my boyfriend.. it lasted about 2 minutes until he started freaking out about being scared. Then he said "I think I came" but he said he was just kidding. Ive had a stomach ache since

. It's been about 2-3 hours since we did it but my stomach still hurts. Am I pregnant?( Mind I'm 15 and my parents would kill me if they found out!) How do I tell if I am without buying a test? Or at all? Please guys I'm really freaked out I'm so scared 😢😢