What Causes Pelvic Inflammatory Disease To Spread Inside Uterus?

I have pid. I was put on two different antibiotic please note it was not caused by std I was check for that however bv. Was the main source of problem instead of coming out it spread inside uterus talk about pain. Well I have a appointment on Monday but my main concern is when I wipe it looks like rolled up dirt is that the infect. Coming out please forgive me if I come off to bold thanks