It could be the start of an Ileus. It's where your intestine go back to sleep
It can happen any time you have surgery like ours but hang in there it is temporary and should clear up within a few days. During that time if you start to vomit call your doctor and let them know about
it. Take it easy on food until you don't have the nauseous feeling anymore and if you can tolerate ginger ale (but be careful of the bubbles) that might help.
If you start to run a fever call your doc, too, since that could mean other things.
Things WILL get better. Keep walking and get your rest!