Period is late... but I’m a virgin!

I’m about 13 years old and I got my first official period on my birthday when I turned 12. Ever since then I had it once a month and had an accurate idea of when it was coming. I’ve been late for a few days now and I’m really scared I don’t want to go to the doctors and I don’t want it to come when I don’t expect it in school in a month. Is there anything I can do to make it come faster?