3 weeks post op & and only lost 8 lbs?
I doubt it would be possible to eat too much right now. How much are you eating? Are you following your doctor's meal plan?
Please note: I AM NOT A DOCTOR. If you want medical advice, talk to your doctor. Whatever I post, there is probably some surgeon or other health care provider somewhere that disagrees with me. If you want to know what your surgeon thinks, then ask him or her. Check out my blog.
My weight loss was slower in the beginning, and then there were some weeks it really picked up. I think as long as you're honestly doing what you're supposed to be doing, the weight loss will take care of itself. I didn't weight myself that often, as I was trying to stop the behaviors that I was enslaved to beforehand. Try to relax and just trust that it will work for you as long as you follow your doctor's plan.