You've lost 4lbs, that's still fantastic & around the average LT expects you to lose! What other diet would you lose 4lbs a week on? Seriously, when you get to the rubbish 1lb I had last week, then you can be disappointed ;-) Well done!
Also, have you taken measurements? Weirdly I got rid of some serious inches last week even though I lost next to nothing! Worth keeping an eye on, as the inches are really more important anyway, right?
Hannah