Gerbils should not be taken to the vet to give birth. Gerbils are prey animals and can become stressed easily. This stress can cause the mother gerbil to abandon or even eat her babies. In addition, the vet's office is a potentially dangerous environment for gerbils, with many potential predators and hazards.
If you are concerned about your gerbil's pregnancy or birth, you can contact a rodent veterinarian or breeder for advice. They can help you create a safe and comfortable environment for your gerbil to give birth in, and can provide assistance if necessary.