Why is it brown?

Me

Little background: I’m 16 had my period for three years and up until January it was regular, now it comes when it wants. Last time it was 60 days this time it was 40 days. I’ve been having bad cramps today and very moody but that’s normal.

Why does my period look like I pooped my pants?

When my period was regular it used to be wicked heavy and dark blood, now it’s wicked light and light red but today it’s completely brown? What does this mean?