Amy, I think I know a little how you feel this morning. I've never focussed on my weight and we don't even have scales at home so I've only ever weighed meself at the gym. I've been loosing weight, getting fitter and lower body fat % over the last eight months which is great, but this morning when I was having measurements and weight updated with my PT according to some calculation he used for weight range I'm actually 11 kgs above the maximum range!! everything he told me after that was a blur as I was caught up on the weight. I actually think he got his calculations incorrect because he came up with a range of 48gk - 53kg for a 166cm female, which is extremely thin and nothing like any healthy range I've heard of before, 55 - 69kgs seems to be what is generally accepted for my height. He was very quick to point out that I shouldn't be worried about the actual weight and just to focus on my measurements, fitness level and body fat % which are all going down so all good.
Amy as long as the general trend is down that is all that matters.
I'm up 2kg!