I'm sure you're fine! Puppies need to eat more anyway in their first year! Just follow the recommendations on the bag!
However, personally, I'd switch foods asap. Pedigree is really terrible. It contains unknown meat sources, by-products, corn, wheat, soy, a bunch of nasty fillers that are not good for dogs. I was never one of those people who believed dog food could be THAT bad - but a lot of it is. If you have a Petsmart or Petco near you, Natural Balance, Wellness, Blue Buffalo are good choices. If you could find a specialty store, even a Pet Valu, I'd recommend Innova, Merrick's, Taste of the Wild, etc. Check out
www.dogfoodanalysis.com for more info.