Hey Bella, as you probably know, most of the users here have UC and don't know too much about
surgery but we do have a handful of posters who have had surgery who can give better advice than I can.
My questions are the following:
Did you have an endoscopy or thorough testing to confirm you do not have Crohn's disease?
Did they remove the entire large intestine including rectum and create the pouch with the small intestine?
Could you have hemmies or a fissure? Do you have pain? I have a fissure that comes and goes and honestly, sometimes it bleeds a lot, to the point it is scary but I can feel it tearing so I know what causes the bleeding.
Have you had stool tests to check for bacteria? You could have a bug that is causing the bleeding.
I wouldn't stress. It is probably due to something bacterial. See your GI asap and find out what is going on. I am sure antibiotics will get you back on track.