Just purchased a standard yorkie last night. He's honestly the cutest thing momma has ever laid eyes on BUT aside from pooping at 9pm last night and a small pellet this morning at 7am, he hasn't gone at all although he has peed like a champ. I'm worried

and was wondering if this is normal for puppies? Any response will do he has also eaten less than half a can of food (4 1/2 teaspoons to be exact). Any help would be great!
Thank you!
I look forward to sharing and reading more Yorkie stories soon