Puppies are nuts when it comes to the things they'll put in their mouths! When my dogs were pups they ate staples, many pairs of shoes, the wall
, my cell phone... I'm sure I'm forgetting some.
What you can do is watch. You're going to be looking for vomiting, diarrhea (or lack of poo entirely), blood in either, abdominal tenderness, not eating or drinking.
Try not to panic too much. These things happen to all of us