2lb is 2lb. 2 bags of sugar you no longer have to carry around.
As for the Chemist, ignore what they say!!! It is different for everyone, it depends how active you are, whether you are still downing gallons of water, TOTM, how much you still have to lose etc etc.If you are getting nearer to your end target you will get the odd week of 1-2lb los, but that doesnt mean you still wont get some weeks witha 4lb loss.
Dont get disheartened, dont give up, dont be tempted and you are doing so well. A 2lb loss on any other diet regime would be welcomed with open arms, such is the success of LT that 2lb is met with a touch of dissapointment, but it shouldnt be. A loss is a loss, and 2lb still makes a big difference!!!