I don't know if your vet does ultrasounds where you live but they do here in the states. I know of a lab who was carrying one pup, the pup got so big because there was so much room for him to grow the vet had to do a C-Section on the bitch but it saved the pup. The pup is grown and still HUGE! I've had ultra sound done on my female too and it's pretty accurate. I just don't know if they can do it a week before the litter is due to whelp?? Maybe your vet could help. Good Luck. Hope you have a nice healthy litter and mom bounces back quickly