A dogs pregnancy can last between 56 and 70 days with a French Bulldog usually carrying for roughly 63 days. The narrow hips of Frenchies prevent most of them from giving birth naturally.
In this case the cesarean section will be performed which is how the majority of French Bulldogs are delivered (around 80%). Your Frenchie pups will probably number between 3 and 5. Its extremely rare to have more than 5 or 6 puppies in a single French Bulldog litter.