Weight an issue?

So that workout on Tuesday didn't make me sore on Wednesday, sure I sure did feel it on Thursday! My thighs and calves especially! But thats a good thing, right? Means I worked those muscles, or does that mean of overworked them? Hmm... I did stretch out beforehand too.
I know that I started including my weight in this, which I really shouldn't. Because I do know that muscle weighs more than fat and in the end, I could be gaining weight. Which is what happened when I joined the Army. I weighed 125 lbs. before I left for basic training, and came back weighing 145 lbs. My weight seems to fluctuate between 3 lbs. as it is. So weighing myself tonight shouldn't be done, but I did it anyways for curiosity.
The results of that killed the cat too! :(
148 lbs. Oh well, I didn't expect to see any drop in pounds, but sure didn't want to see a gain.