Well, considering that this was indeed an unplanned and irresponsible accident you better get ready and prepare yourself for these new babies. AND YOU NEED TO know when she is due. Pay the money and have an ultrasound done so you can at least know how many puppies to expect and how far along she is. Get a whelping box ready, make sure she is on a good quality food, and set $1000 aside for a possible c-section! I hate to be blunt, but this is the least of what your dog deserves.
Breeding and puppies, accidents or not, are a HUGE responsibility. Dogs and puppies die in shelters everyday because of these types of accidents. I am not trying to be mean, I am trying to be honest.