Hi, my puppy is 7 weeks old this next week he is going to be 8. I got him 2 days ago and the first two days he was happy playfull, eating well, running, but today he is just been laying around sleeping a lot more than normal he is eating but not playing I don't know if this is normal because of the change or if he is sick please help me out I'm verry worry!

I would be wary, no good breeder lets a puppy go before 8 weeks of age.

Did you get a vaccination card with him to prove he has had all his shots?

In saying that though puppies do sleep a lot, they play for half an hour, sleep for 2 hours then get up and play again.
If you are worried just give your vet a call and see if they think you should bring him in.