Dog Results X-Ray

Hi. I recently had my dog checked by a vet for an abdominal x-ray to count the number of pups. I tried to count the number of skulls that I saw on the film and there were 4. My vet told me that there are possible 4-5 puppies for this litter. I would just like to ask if how many pups do you see?

PS I tried to encircle the number of skulls that i saw. Do you think i counted it right?