Should I still be worried about my colon health?

I’ve been experiencing rectal bleeding/mucus for almost five months. I had a colonoscopy today and the doctor explained that I had inflammation (ulcerative proctitis), but nothing else that she could see. She also explained that she went all the way up to the small intestine, taking five biopsies. Because she couldn’t see anything, does that mean I am immediately free of health concern? Or could something come back on the biopsy?