First weeks you will add water, that is the first thing people think is muscle. It can look lik you have gained some nice lbm, and you might have. But still, it's mostly water. If there is no gain every week you have t change something. Don't forget you have to bump cals with your bodyweight. You will probably burn more calories while on than off, both with increased metabolism but also with a higer intense in the gym maing you sweat and burn off more cals. So do this: Check how much you are eating in cals - protein - fat - carbs. I firstly would bump the protein up to 2g per lb bodyweight. Second, you might want to decrease weight training if(I'm not saying you are..) you are workoing out in the gym 5-6 days per week.
It's all in your diet, so look into this and see if you might be eating to little. Eat more solid foods and decrease whey protein during the day. Before bedtime eat 60-70g slow protein, meat, casein or whatever.
A friend of mine told me we didn't gain shit and then I looked at his meals, he ate to little..Simple as that. He had gained 10lb and was sweating like a pig. I then told him to make a new plan from the current weight and quess what happened. He started gaining again
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