[Harmony♥]

While an app on the phone might work, it's very generalized instead of personalized. When I got my first period, I was about 11. I was excited, and it lasted about a week. The next month, I never got my period. But, the next month after the skipped one, I've gotten my period every month and I've now had my period for about 12 years.

Typically, periods are every month, and it all depends on the person on how long they last. Mine can last anywhere between 4-7 days, but I'm on birth control, so I have a pretty good idea when my next period is coming. For you, since you've only just gotten your first period, it could be very irregular and you may skip next month or you might not. It all depends. When you have your period more frequently, you will have a better idea of when it's coming next.