I've been going to the gym for a month now and I gained 4 pounds.

I lost a few inches in my waist, but all the other measurements were
either the same or slightly larger. I'm so frustrated!
I work out 5 days a week. For 3 weeks I did cardio for 5 days and weights 2 days a week. Now, I do weights 4 days a week and cardio 5 days a week.
My cardio has improved (longer time, higher elevation, etc..). I do 10 mins of the eliptical machine and 25 mins of the treadmill. (That doesn't include warm up and cool down).
My eating isn't perfect but it is better than it was before. I'm not snacking as much because the exercise kills my appetite.
SOOOO.......did I just gain muscle or am I doing something wrong?
Paula