. . "Other possible symptoms include: pelvic pain that gets worse after sex or after a pelvic exam a very heavy period lower back pain constipation, diarrhea, or feeling pain or seeing blood when going to the bathroom (endometrial implants can press on some of the organs involved in getting waste out of the body, such as the bladder, intestines, and rectum) If a girl notices these symptoms, it does not" . .