In the past 2 weeks I've ranged from 150 to 146, and not necessarily in that order. Yesterday I hit a new low of 146, but today I'm right back up to 147. Yesterday I ate 1883 calories, which is not more than usual, and I did cardio and weights in the gym. No reason to go up, but I've noticed after hitting a new low the scale will go up again for a few days or a week, but will then get back to that low and then hit a new low shortly after that. I've found by tracking the fluctuations on a spreadsheet, I dont need to worry about the fluctuations.
Like Mel, I dont even pay attention to my weight at the doctor's office because I have on clothes and have been eating before getting there. My real weight is just me not me plus food and clothing. If I want to weigh food and clothing, I'll do that separately
I do agree that the number doesn't really matter, its more the direction of the scale. Which is why its also important to go by the same scale as they do tend to fluctuate.