If this is my first period how many days will it last?

Okay, so for your very first period (and maybe even a few after that), it's really normal for it to last anywhere from 2 to 7 days. Seriously, it can be super short or a bit longer, and both are totally fine.

Your first periods are often pretty light, more like spotting than a heavy flow, because your body is still figuring things out. It's like your body is doing a practice run before it goes fully live. It might be unpredictable too, like, one month it's 3 days and the next it's 6, and that's just part of the first-cycle journey.

Over the next year or two, your periods will probably start to settle into a more regular pattern, both with how many days they last and how often they show up. Just try to go with the flow (literally!). If you're bleeding for way longer than 7 days, or it feels super heavy like you're soaking through pads every hour for several hours, it's a good idea to tell a grown-up just to make sure everything's okay.