I know what you mean, I was disappointed with my weight losses at first, 5lb, then 4lb, etc, the lowest one week was 2lb (totm but still frustrated, lol!!!).
I think I was expecting all my excess weight to be gone within 3 weeks as I had told myself I would only do LT for 4-5 weeks, maximum.
But im now 6 weeks in and have lost 18lbs, which im really starting to notice, as are other people which is a bonus
But the best thing is fitting into my clothes, I had a lot of clothes which didnt fit me or clothes that I wore but looked huge in (to be honest, I looked a mess in). Now these clothes are loose or they fit nicely without extra flabby bits showing!!
I also took out some clothes id "stored" cos they didnt even fasten on me (I shoved them away hoping one day they would fit!) - I tried them on at weekend and they fit, not tight or squeezed on, but actually fit and fasten without breathing in or lying down, LOL!!!!
Ive waffled but what im trying to say is it may not seem a big weight loss at the time, but in a few weeks you will definately notice and feel the difference and be REALLY pleased with yourself for the odd 4/5lb losses, over the weeks they add up to lots!!!!!
Stick with it, hard work but sooooo worth it
Good Luck x