After a colonoscopy you may have some loose stool as you just did the "big prep" and if they took a biopsy you may have some minor spots of blood. You should have received written instructions from your GI with when to eat and what as well as what is normal and when to call the GI Doctor. If you start to have pain, bleeding or a fever, call you GI immediately.
We are fortunate to have a GI Doc that calls everyone of her scopes the evening of the scope to ask you how you are? This gives you a chance to ask the question you were maybe to drugged to remember what you wanted to ask. :) She is one of a special breed. Take care and hope your biopsy is good news.