I got really really bad cramps yesterday. But haven't had my first period yet. When will it come??

If you have bad cramps it might mean that you did something in the past. Or your period could come up soon in the future. Don't worry, periods will come. You just have to be patient and don't listen to the others if they already have their periods. That would only stress you out. In my honest opinion as a girl, periods suck. Having blood rushing out of you at any moment is just disturbing and annoying... But anyway, hope this helped you!