Drink lots of Water and a few doses of Miralax. It is quite common between surgery and the change in diet to be constipated. It does get better though!
Ask your doctor to prescribe a stool softener like colace. My doctor started me on it from day 1. I had my first BM 5 days post op. Home remedies may vary, but making sure you get in all your fluids will help. During the all liquids phase I would add a bit of spinach to my Protein shakes for the bit of extra Fiber. Once you transition to soft foods and purees try to get in a bit of Fiber and mushy veg. One poster's recommendation was for every 2 bites of Protein, take 1 o f veg. Walking may also help.
In the meantime here's a list of things you could try: ducolax, miralax, milk of magnesia, Smooth Move tea, prunes or prune juice, black coffee, black Beans, tsp of epsom salt dissolved into organic grapefruit juice.< /p>