don't worry too much about daily fluctuations, it's most likely just water weight. actual fat loss should ideally be 1-2 pounds per week (less if you're really lean, perhaps more if you're quite overweight). to eliminate the noise of daily weight changes, track the 7 day average weight and compare most recent to 2 weeks prior. if your weight loss stalls, you can either move more or cut calories more (don't go below 10x body weight, e.g. a 180 pound person shouldn't eat less than 1,800 calories). if you're already working out every day AND at the bottom end of a healthy calorie range, do a reverse diet to speed up your metabolism. most importantly: don't give up, you can do this!
cheers!