Up since surgery?!

I just had my RNY on Tuesday last week and I too gained after surgery -- but thanksfully only by 6 lbs.  Today is 7 days post-op and this morning I not only lost that 6 lbs but lost another 8 lbs on top of that!!  I am down a total of 25 lbs since starting the liver shrink diet 3 weeks ago!  Wonder how long these 2-3 lbs drop each day will last!  WOW!