When weighing yourself, it's best to do it naked and at the same time of day; first thing in the morning for instance. And ideally, don't do it daily. Do it weekly.
However, you really shouldn't only be going off of weight alone when tracking progress because lean muscle is much heavier then fat. You can loose size while weighing more.
It's very common in women who don't often workout. Their initial results get skewed because of beginner muscle gains. You'll often see women gain a couple pounds on a scale but loose an inch around their waist during the first week or two.
The best way to track progress and not become demotivated by a scale is to track your physical dimensions with a tape measure and compliment it with progress photos; in addition to the scale.
It could be water weight. Also, are you weighing yourself at the same time each day? If not, you should be.
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3Opinion
Clothes can be a factor, so weight yourself naked or wear as little as possible. Also, weigh yourself at the same time each day.
Yes, water weight can be ~ 3 lbs depending.
Weight does varry slightly from day to day.
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