Hi doctor. Height: 5'4, Weight: 116, Meds: Zoloft and Tri-Sprintec. I'm a 21 year old non-virgin female and I'm about 10 days away from my period. Two night's ago, I was masturbating with the round end of a makeup brush, about 7 inches long. I've done this before with no problem, but this most recent time, there was dark brown blood on the end of the brush when I pulled it out. I immediately when to the bathroom and wiped, to find a thick stain of brown and red blood on the tissue. I've been bleeding like this for two days now and it's as if I started my period, even thought I'm 10 days away. My mom thinks I may have dilated my uterus and caused the blood to come out prematurely. There was no pain during or after the masturbation. Should I be worried? Help!?