It is common post surgery, as due to the effect of anesthesia
drugs, secondly due to less mobility following surgery, so the bowel movements reduce.
Nothing to worry, you can have lactulose
syrup or isabgol, warm water intake for the evacuation of bowel, also increase fruits and green vegetables intake and also walk after having your meals, that will help you regain the bowel movements. If this does not help you you ca consult your doctor for further advice.