Initial weight gain after resuming weight training??

Question

A few weeks ago, I begain lifting weights again and getting back in shape after taking a break to recover from an injury. After just a couple of weeks I noticed that my body seems firmer, my strength is coming back very quickly, and my clothes are loose. I was very surprised to see that I have actually gained about 5 pounds! I know that muscle is dense, and because I'm lifting moderate-heavy weights for my size (squat press between 275 - 300lbs, pull-down 100lbs) I expected to gain a little bit of muscle weight gradually over time, but it surprised me to have gained 5 pounds in 2 weeks....especially since I'm looking slimmer.
Is this normal? I'm a 29-year-old woman, i'm 5'3", and (now) weigh 125 pounds - short, athletic body build.

Answer 1

You're body is just gaining muscle, and you can probably assume that a 2-3 of those pounds could be water weight, etc.