Is It Normal To Have A Small Amount Of Blood In Stool The Day After Colonoscopy And Polyp Removal?

had small amount of blood in stool, had colonoscopy and found two small polyps. doctor removed polyp, said he only found old blood in diverticula. next day first bowel movement, still had small amount of blood in stool, is this normal ? Also prescribed doxycylene and flagyl for ten days.