i think anything from 0.5 - 2lbs is 'normal' if you stick to plan.
Some people lose LOADS more, but that can be for a variety of reasons - they may have more to lose, so lose quicker, they might have gained the week before or only lost a small amount the week before. They may have been exercising all the week, they may have eaten a million speedy foods blah blah blah!
Dont be dissapointed in losing 0.5lbs - its a loss!!!! Well done xxx