Low grade fever 2 weeks post op.

I had a gastric bypass on November 5th, came home feeling pretty good, but for the last 4 days I have had a low grade fever which is completely sapping my energy. It's like I have the flu and everything feels like a massive effort. Doc says it's not uncommon and doesn't seem to be concerned...anyone else go through this? 

Low Grade fevers can be normal. I had one for a couple days. Keep monitoring it though if it hits 101 or more then it's cause for concern.