I'm guessing you didn't work out prior to this? If that's the case then your gains are just catching up to you. Your body's just getting used to all this and it doesn't feel as if you're gaining as much as you did a week or so before. You may want to change your workout. This will cause muscle shock and force your muscles to grow. I don't know exactly what it is your doing or what your goal is so that's all the advice I got right now. It's not always good to work out 7 days a week. Only you can tell when you really need a break and if your body feels that way lay off the workout for a day or two.