Two things to remember
1. You may gain 2-3 pounds in moving to or going on CAD.
2. Your weight fluctuates every day.

Otherwise it is very common when moving to CAD to have very unbalanced RMs in the beginning. It is the syndrome of the kid in the candy shop. For a long time you deprived yourself of the foods allowed on CAD, therefore you now tend to go overboard. More balance will creep in after a while. And no, you won't gain weight as long as you adhere to CM and the 60 minute rules which keeps your insulin under control. How much weight you lose during this time really depends on your own particular body chemistry. Some people lose quite well with unbalanced RMs, some lose more slowly and some don't lose at all.

Give yourself time to get used to this WOE (way of eating).