My set of bathroom scales said one week i'd put on 3lbs, instead of loosing- so crying i got my housemate to stand on the scales. (He's one of those types that has stayed exactly the same weight for 30 years, even after coming home from an all-inclusive holiday where he ate everything and anything he weighed his usual 11st 5 lbs) and he'd put on 3lbs as well! so we trudged over to a friends house, and used his scales- and ta-da! weight loss again of 3lbs for both of us! promptly bought new scales. I know how utterly disheartening this is for you though, as you focus so much time and energy into the diet/cooking/choosing recipes etc and when it doesn't work, it's like, argh! keep going and good luck