My weight goes up and down all the time. I think my body is trying to decide whether or not it really means it. From what I have heard around the boards, your fat cells will fill up with water for a few days before they finally dump it. I have a chart that tracks my weight loss and you can see ups and down all throughout. At first it freaked me out, now I realize it is normal. I had more miniplateaus earlier on, now the ups and downs have gotten more and more frequent the closer I am to my goal weight.