First of all , let me assure you that your appendix
surgery has nothing do
with the problem. However, If you were put on antibiotics during your
surgery or after , it is possible to develop an infection by C-Difficile
bacteria that can cause alteration of your stools. Most often this is
associated with diarrhea
and sometimes with blood. That could be mild,
moderate or severe. If you have been treated with antibiotics ,I would
recommend that you have your stool tested for C-Diff Toxins A & B.
If positive you will need treatment.
Wish you well.