I Had A Bowel Resection 4 Weeks Ago. Overall I

I had a bowel resection 4 weeks ago. Overall I am doing fine. The first three weeks, I was severely exhausted. Going into week 4, I felt much better. Yesterday, after my final follow-up, I went back to the gym and tried a light workout. It was hard after being away 4 weeks, but I expected that. Today, I feel as exhausted as the first weeks. Did I do too much? Should I push through it? How long will it last?