There is some disagreement in the literature about the risks involved in vaccinating pregnant cats. This is a disorder in which kittens have difficulty balancing and with fine motor movements. However, there is also a large study that suggests that this does not occur, or if it does, it is a very infrequent problem. I think that the odds are in your favor that everything will turn out OK but as a routine rule I still think that it is better to avoid vaccinations during pregnancy when possible. Since you didn't know your cat was pregnant there was no reason to avoid vaccination at the time.
Most cats deliver their kittens with no problems.
Good luck with all of this. Cats are usually pregnant between 58 and 65 days. It usually takes four to six hours for cats to deliver a litter of kittens but this varies widely from cat to cat. If there is an interval of longer than 4 hours between kittens and the cat still seems to be trying to deliver kittens or is not comfortable, she should be checked by a veterinarian. The normal gestation period in cats is 63 to 66 days.