3 months post op breast implants - hurting! Is this normal?

I had 400 cc silicone implants under the muscle done 3 months ago going from an A to large D/small DD. I teach Zumba and haven't had any problems. I haven't done push-ups or weight training yet. But I am starting to be extremely sensitive and experiencing pain when touched or when massaging. My chest muscles are sore as if I had been doing a lot of pushups. I hadn't been experiencing any pain at all until a week or so ago. Normal?? Other than that, they are fantastic!