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 alot more than normal he is eating but not playing i dont know if this is normal because of the change or if he is sick please help me out im 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.