im 15 years old, i have not had my period yet, nor have i had sex and i would not intend to at my age. The other day i felt something uncomfortable in my knickers, so i checked it out and it seemed like black viginal discharge was in my knickers, ive always had white virginal discharge since i was 12 and now suddenly this occurs. however it has now gone back to normal.please tell me what happened to me, is it just puberty or is it p;blood? Please help me, do i have something wrong with me? Should i go to the doctors, however i am Embarrassed. HELPPP ME!