Weight fluctuates, don't worry about a few days up. I have some much weight loss data ita crazy. Some times you get those lb drops, and then you go up a few days and then you drop again.

To give you an idea, I gained 7lbs the day after Thanksgiving one year. When I'm dieting, I keep my diet pretty clean, and the amount of salt in a Thanksgiving meal is insane. It can take a while to drop that water weight again, but in the meantime, if you're in a caloric deficit, you're still burning fat regardless of what the scale says.

Keep up the good work.