Help I am 13 and I have gotten my period before but it's been really weird. My first period was 17 days and I had a few long ones after that but it's been a few months and nothing happened, now I have brown stuff in my underwear and it's not too much, but it kinda looks like poop. It's stringy and it kind of hurts down there, but not like cramps. And my vagina looks different, help!