Hi, I'm just starting my third week, too.
The atkins bars almost always stopped/slowed my weight loss on the days that I ate them. I even gained a pound. When I stopped eating them, the weight dropped back down and I feel like I am still losing although weigh in day isn't for a few days.
Everyone is different but I've noticed by reading a few threads here that a bunch of people have had the same "stalling" result when eating the Atkins bars.
Hope that helps!