Repeated weighings is a way to drive yourself nuts! It would be better to throw the scale out the window.

The ONLY time you should weigh yourself is
1. in the morning
2. after going to the bathroom
3. stark naked

And not again until the next morning.

YOu can gain a pound just from being up and having a coffee. Food and drink weigh something, so you 'gain'.

The most important thing to remember is the most scales are SO INACCURATE that they are stamped "not legal for trade". Which means "not to be believed" except in the most general way. You probably paid less than $30 for the stupid thing, so you are getting what you paid for. Those big scales in the doctor's office cost hundreds of dollars so they are somewhat more accurate.

Day to day weighing can also drive you nuts. It's best to look at the number you get on Friday morning and compare it to the number of the last Friday. Then you'll be able to get a better idea of what is going on.

Of course, the best measure is a measuring tape. Or a piece of tight clothing that you can observe becoming looser.