Don't often recommend driving a cat about to give birth to the vets as this can be very stressful. I'd be surprised if the vet says to bring her over. Just keep an eye on her in case she has any problems. Cats are pretty self sufficient and I wouldn't be surprised if you missed the birth all together. Our farm cats would go wherever a person couldn't fit to give birth. Good luck with the new kittens. PS: they grow fast so I'm sure everybody expects pictures galore