AAHHH!

Just went to the gym for an hour. Did the elliptical for the first 10mins to warm up and then spent the rest of the time lifteing weights. I weighed myself at the end (like I always do) and I am up 2lbs for a total 124lbs. I know that muscle weighs more than fat, but I really thought that switching to more cardio instead of the lifting I usually do would have made me lose weight not gain it.