are you weighing yourself each day and taking an average over the previous 7? My morning weight doesn't fluctuate too much day to day, but there is the odd day that it might be 2-3 pounds heavier. Might account for a little bit of the weight loss (or lack thereof). I also find with a start of a diet there isn't too much weight loss in the first 2-3 weeks and then all of a sudden it happens. There also isn't a huge change in the mirror unless I do something drastic right away. Unless you have a specific date in mind, I'd just stick with the plan for a month and modify, why change things weekly right?

However, like you said, 2 lbs per week target - yes, you'll probably need to keep an eye on things weekly