There is only pain without fever and other symptoms then it might be due to mesh impaction on the abdominal wall when strenuous activities are taking place
It reduces as days progress
Avoid strenuous activity
If fever or any vomiting or not passing stools then it is of concern and it may be suggestive of hernia/mesh complication.
Next Steps
avoid strenuous activity
watch for fever vomiting and if stools were not passed
if such symptoms appear immediately consult your doctor where surgery is done