Discharge question? HELLP?!?

okk. welll yeah im 12 and i havent gotten my perioddd yettt, sorrry to gross yaouut, but like everytime i go to the bathroom or change underwear theres this brown stuff inthere? like dark dark brown. it almost seems wormy, texture like. ive been hearing its old blood but im really not sure? when i pee, i wipe and it seems like i just wiped after i pooped. lol well thats how it looks? and whenever i poop real blood comes oout ( of the area, not the t ), well pinkish? ehhh. is this old blood or not?HELP!?