
My vet wants to scan at 5 weeks as well. I took my bitch in absolutely certain she had NOT taken. She was 5 weeks to the day with no signs at all. The vet saw 8 pups with probably more hiding. Yes it would have been obvious a week later, but it wasn't then. In this case we wanted to scan to check for heartbeats above all as the bitch had been bleeding/had a discharge just over 2 weeks into the pregnancy. I was sure she'd lost the pups but she hadn't.
It all depends on the skill of the person who scans. I used to use a sheep scanner, she said she had failed to spot so many pregnancies early on (told owners the bitches were not pregnant, then they had litters) that she had to tell bitch owners to not come before 5 weeks.
£62 per scan sounds very expensive to me -my vet charges £25!