Weight

When many people think of weight, they tend to see it from the point of wanting to lose or gain it. Say you're cooking or baking. You go to measure out the ingredients you want. You put them on the scale and you realise you have to much, so you take some out, not wanting it to effect the out come of what you are making.
What I'm trying to get at is you're not looking at it as being something fat or over weight.

When you step on the scales, all they are doing is showing you what effect gravity has on your mass. Yes you can effect how much mass you are carrying around, but more mass does not equals a load of body fat. You can take two people of the same age, height and weight. Essentially they have the same BMI. Now even though everything is the same one will have a much higher body fat % than the other, and this is what will determine how healthy they are. Not BMI and not their weight.

The scales, like many other types of measurements and calculations are a good reference point to use in your health and fitness goals.
It's not worth the aggravation of worrying about being a few pounds heavier than you was the week before. If you follow a work out programme, where you are working intensely enough you will be adding strong lean muscle. This will make the muscles much denser and in turn makes you heavier, but you will be lean because of it.