How do you know I will get my first period

You can't know for sure the exact day your first period will arrive, but your body gives you some pretty clear clues that it's getting ready, so you know it's coming!

First, you might notice your breasts starting to develop, like little buds are forming. Then, probably about two years after that starts, you'll get what they call a growth spurt. That's when you grow, like, a bunch all at once and everyone is like "woah, you got tall!" And then the last big sign before your period shows up is usually discharge, which is this clear or whitish stuff you'll see in your undies.

Discharge usually starts a few months to a year before your actual period, so it's a good heads up. Everyone is different, but most girls get their first period between 10 and 13. It can be earlier or later though, so don't stress if your friends get theirs before you, or if you get yours before them. Your body is on its own schedule. If you want to get a general idea of how close you might be, there's a quiz that can help: how close is my first period?