text: what happens when you get your period?   when you get your period, you bleed down there sweetie.  a girl becomes a young woman when she gets her period.  we have periods because we were born to reproduce.  so every month, your body makes an egg, if you don't use your egg, like (if you don't get pregnant) then your egg sheds, and that's where the blood comes from.  this shedding can lasts from 3-7 days.  if you have cramps really bad in your stomach area, take a couple of aleve tablets.  they work really well for me.