Well, first of all - kudos to you for adopting this dog and for accepting this further responsibility.
While I, too, would encourage you to do a spay on her now it's pretty obvious that you won't do that. I do hope that the bitch doesn't run into problems during whelping. German shepherds can easily have 8-10 pups. If the bitch were to die during whelping, you will be stuck hand-raising these pups. I've done this, and it's HARD. We fed every two hours. It was not just a matter of feeding the pups .. then they had to be wiped to stimulate urination and defecation, then cleaned up and the box cleaned and all that. They had to be kept warm and dry. As they grew, the feedings spaced out a bit more but it got MUCH more messy. We were sleep-deprived for weeks. I wouldn't recommend it to anyone - and if you're working, it will definitely affect your work ability.
I really recommend that you do some google searches for "whelping puppies" or "dog pregnancy" as you can find some great articles explaining the entire procedure and what to do. I believe there's a post on building a whelping box at the top of this section, and I've found other articles online that describe various boxes. You need to stock up now on paper, towels, iodine, and various supplies. You can find more information on what you'll need with a search online.
You'll probably want to line up potential homes for at least 8 puppies. Keep in mind that many times people say "yes, I want one!" and then when the time comes they decide they can't take a pup. Finding responsible homes that can afford to take proper care of a puppy and who will make the dog part of their family and not just tie it outdoors can be tough too. Many people don't realize the commitment it takes with a shepherd. They need socialization and training and they shed 365 days a year. It's important that those who may want a puppy now understand that they're taking on a 12-14 year commitment.
Just one last thing about the abortion issue .. while I know that you are opposed to the concept, in all honesty it is more kind to the pups to not be born than to live a life of misery or a life being passed around. The majority of dogs do not find their "forever" home as pups. By making the choice to allow these pups to be born, you're accepting the responsibility for every bit of pain, discomfort, hunger, and sadness that these dogs will experience for the next 12-14 years. That's a huge responsibility. If you really think that you want to carry that burden (and the knowledge of that burden for the rest of your life) then allow these pups to be born with that full knowledge.
Good luck to you and good luck to the bitch -
Melanie and the gang in Alaska