Wow, what a wonderful example of pit bull owners and why the breed is in the shitter. You don't understand why two females might fight (here's a hint, they are pit bulls) and your dog is pregnant, you don't have room to keep the dogs apart but you are going to have room for 10+ puppies nobody will want? Why exactly was your in heat dog anywhere near an intact male again? Here's an idea, call around until you can find a vet that will spay/abort your dog. Get a breakstick and learn how to use it. Keep the dogs apart. Get the other dog fixed before she "accidentally" gets pregnant too.