I was just like you last month.....I stayed the exact same for 10 days around the three week mark. I researched it and found out it has something to do with glycogen and your body adjusting to the new eating/metabolism and basically saying WTH itself. I'm happy to report that it's now a month later, and I have lost another 10 lbs since the stall. It was driving me crazy, and my nurse suggested I put the scale away and get it out just once a week. (I do it twice) That helped, too. Hang in there.