Thank you for your question. A photo would be helpful, but I would say from experience that I would expect your umbilicus (belly button) to return to it's normal appearance as the swelling decreases. It would be best to see your surgeon to get reassurance from him or her.
It is difficult to say without seeing photos, but it is likely that you have swelling and this should subside and the area should eventually look more normal. Best to be seen in person to be more precise.