My weight has tapered off a lot too, and I'm almost 3 weeks out. My surgeon said it could be 2 reasons: Your body is used to getting it's energy (to metabolize things) from carbs, and being on our new diet that consists of almost zero carbs our bodies are adjusting to finding new ways to create energy. Also, I'm not sure if you've begun working out yet, but when we work out we're converting our fat to muscle, and muscle weighs more so there will be a plateau in your weight for a while. But don't be discouraged! Keep it up and stick to your diet (as much as possible, nobody's perfect) and try and get your exercise in. Like I said, no one's perfect, so do your best and try to stay positive! The chat room is also a great source for support for people who understand what you're going through.
I hope I helped!