Weight Gain After Surgery

I'm 5 weeks out from a mini tummy tuck and I haven't lost anything.  The first week after I was up about 7lbs, since then I've been running between 143-145, which is about where I was pre-surgery.  He says they took off about 3lbs of skin, I was hoping to end up about 140, I'm not sure if it's what I'm eating or fluid.  I go for a recheck next week and I'm hoping it's the fluid :)

I had a mini tummy tuck on 11/9.  I weighed 171 day of surgery, had 4.4 lbs of skin removed and a week after surgery i was at 176 lbs.  My weight has come down nicely and the surgeon said for me most of the swelling is gone.  This morning I weighed 164.8.  Because I had no muscle work done/no lipo, my swelling may have been less severe.