So I started my period a day late on the 4th it started of brown then went to my heavy flow, then the next day it was still a little heavy the 3rd day I didn't have to wear anything and 4th I didn't have to wear anything but had blood on and off 5th day blood on and off and 6th day blood once usually my period are right on and only 5 days at most. What is this?? Idk what I should do.