Hey ghost girl!
Lots of good comments here. One of the best things you can do is what Kim suggested. Give a run-down of your daily diet for the past few days....what you've eaten....so it can be assessed. As long as you're eating correctly, you should not have to worry what the scale says on any given week.
I'm also assuming that you were expecting more than 2 lbs. because most people lose larger amounts the first week or so when first starting a diet? (assuming that because 2 lbs/week would be good if one is well into the diet...any diet) Because Atkins is a metabolic diet...instead of a calorie-counting one....your body will show some unusual water fluctuations....through the entire diet, in fact. What typically happens with other diets won't necessarily happen the same way it does with other diets.
I'd say that with Atkins, you have to go by monthly numbers and that anything more frequent will be very fluctuating. Seen from a wider perspective, as long as you're trending downward, you're doing fine. Also, go more by how you're clothes are fitting than the scale number on any given day.
deena
Added: Also...I absolutely did have to limit my Splenda in order to lose. More than about 3 packs a day would stop the ketosis and get me nowhere.