How Can I Stop Worrying So I Can Have My Period?

I'm sort of in the middle of a pregnancy scare and I'm spending every waking moment panicking. The chances of me being pregnant are really small, though, and I think the reason I'm late/having pregnancy symptoms is because of my panicking. Does anyone have any advice or anything on how I can calm down? And before you say "Take a pregnancy test", I'm obviously a minor, I don't have any way to get one, and I'm sort of too scared to find the answer.