Lol, oh, honey, NEVER weigh yourself after you work out! That's a cardinal rule! Your weight is almost always up after you work out. If you're drinking water, especially, because water actually weighs a fair bit, and it's just sitting there in your stomach, making you weigh a pound (or more, depending on how much you drank) heavier. Also, muscles retain water while working out.
First thing in the morning is a good time!