You’re a week out from what was a pretty major surgery. You’ll be healing & recovering for a few weeks & will feel random spasms of pain or discomfort during this time. Sometimes it’s simply moving in the wrong way or bending or lifting that can cause what is like a muscle pull. There are often internal sutures to support your tummy & intestines which are easy to ‘pull’ or ‘strain’ if you do a little too much, too soon, or move too quickly. Same with feeling tired & having little energy. If you feel tired it’s your body telling you to rest so it can heal. It does get better & you’ll start to feel like your usual self soon.
Of course if the pain gets worse, is stronger than you have been experiencing or is persisting, get in contact with your surgeon or go to your nearest medical centre just to be sure everything is okay.