Um well if there just Clear liquids, Jello and whey Protein shakes going into your system you should have some movement; however, your body is in shock and in healing mood so yes, it's normal.
However, I did take laxitive after surgey per my Doc instructions to avoid strain and to much backage becuase your still consuming 60 grams of protein a day in liquid form.
So I would go with how you feel I was really in pain and maybe my issue or more individual than as a general role becuase prior to surgery I was irregular.
Hope this helps!