weight loss....pre-op and not dieting?....

ok so please can somebody tell me if this is real or a figment of my imagination.......i feel like i've been losing weight for the last few weeks or so and i feel this in my clothes fitting better and more loose than usual, however i get on the scale and it doesn't seem to move....my question is this ...is it possible to actually be losing but not have the number go down on the scale? 
thanks for any replies 

all the best
stephanie

Yes it is....You can lose inches before you can actually see the scale move....

Hope this helps
Linda

 it could hve a lot to with shifting weight or losing inches and gaining muscle