I lost 20lbs in the first 2 weeks after surgery, then gained 17lbs at 2-3 weeks post-op, and then lost it again 5 days later. Apparently Water retention and my body just going into some shock from the surgery. This was while I was still on the liquid only diet. I have started losing again, but it's slower than I had expected based on what I've seen in other people. Your body might be in a little bit of shock, too.