Cervical cancer?

An

Hi, my period ended a while ago and my next period isn’t starting anytime soon. Whenever I wipe, I see this. Earlier today I went running and when I came back, there was a bunch of DARK brown discharge everywhere. I don’t believe it’s leftover blood for my period and I’m not ovulating. Some of you probably have seen my previous posts, but I’m including a picture in this one. Again, I am 16, have normal periods, not on birth control or sexually active. I am now experiencing some mild pelvic pain. Has anyone had this experience and could it be cervical cancer? I want to know if it’s normal, or enough concern to go to the doctor.