Weight fluctuation are normal. I have heard people get a little discouraged when their weight goes up a little. A lot of that is water! A gallon of water weighs a little over 8 pounds. There are 128 ounces of water in a gallon, so you can get eight 16oz glasses of water from a gallon. So simply by drinking one 16oz glass of water, you will gain a pound! Does this mean you shouldn’t drink water! NO! You need to drink water! In fact if you are trying to lose weight, you want to drink more water. You need water to burn fat, and flush all the waste stuff out of your body. And you aren’t drinking enough water, your body goes into a survival mode, and starts storing it.
Anyway, depending on how much you have eaten, and drank, and how much you have sweated, or excreted, your weight is going to fluctuate from day to day, or even throughout the day. So don’t worry about it.
Don’t pay so much attention to the scale. Pay attention to what the mirror says, or what the tape measure says, or how your clothes are starting to feel a little loose.
If you are eating low fat healthy food, and exercising, then the weight will come off. Maybe slowly, but it will come off.