Sometimes, when girls get their periods, their tummy might feel different, and they might poop more or less than usual.
This happens because our bodies have special things called hormones that change how our tummy works during our periods.
These hormones can make our tummies move faster or slower, causing tummy aches or changes in how often we poop.
If your tummy hurts a lot or you see blood in your poop, it's important to tell a grown-up so they can help.