im 14 and i cant tell if i have my period or if theres something medically wrong. about yesterday or 4 days ago i saw blood in my underwear. then the next day it was gone. then about 2 days ago, i put a liner on before i went to sleep and woke up with blood. then, i bleed yesterday slightly, and today i barely bled at all. but after school i went to the bathroom and my pee was fine but when i wiped there was blood.