Endo of the bowel

Has anyone here ever had endo inside your bowel or in the wall of any other organ? Bladder, maybe? I've heard it's possible and before I was diagnosed with Endo, I had a colonoscopy and they said they removed two small "tumors" but never tested them for anything. The doctor who did my scope isn't necessarily the most "out of the box" thinker and I always have blood in my stool and rectal bleeding during my periods. It stops as soon as my period ends and it happens every month. I was wondering if it's possible those "tumors" were actually endometriosis and if I could have more that's causing the blood in my stool during my periods.