Thanks for your kindness in donating. Well wishes for both of you.
Since you used muscles that have had a long layoff and some major abuse, the soreness may just be muscle fatigue. If you have no swelling or redness I'd give it a day or two of rest first. If there are any changes for the worse I'd sure call the surgeon.
When you feel better, you may want to begin with gentle stretching and work your way slowly into activities. I was actually running before two weeks were out (I did ask the Doc)...and it made me sore but that didn't last long. I was most cautious with core training, but after a while I forgot about the incision and went back to full on workouts.
Let us know how it goes. elephant