The scales only tell half the story. At the end of the day you want to look slimmer....
Now imagine 1 pound of butter, and then 1 pound of lean steak.
They both weigh the same, one is fat and one is muscle. The more you have of the latter and the less of the first one, pound for pound, the slimmer you will look.
Muscle also burns more calories per day than fat, so raising your metabolism.
You are not going to suddenly have muscles like Arnie doing cardio, but if you haven't done any exercise before you might gain a little muscle but it's a good thing! Don't worry if you don't lose on the scales as long as you are looking trimmer, because that's the aim at the end of the day. Do you want to weigh xx and be a size 14, or perhaps weigh a bit more and be a size 12?