Hiya, I think that is a incredible loss..I started 2 and a half wks ago and lost 3.5lbs in my 1st wk which isn't much more.
A couple more things to mention.. your weight loss will heavily depend on your starting weight and also its better to lose at a lower rate as you're more likely to keep it off long term.
So please don't be disappointed with yourself or WW, its a great plan and does work well long term. 3lbs off is a wonderful achievement so be proud as you clearly made a great effort. X