I think the best thing you can do for your dog is have her checked by a vet. If she is pregnant I'm sure the vet will advise you it would be in her best interest to have the puppies aborted. Such a small dog at such a young age has too many risks against her.
And as for you being so adamant and not want her spayed. Why? When I got my two cats, I knew I wanted them fixed, because I knew I could not afford to have several kittens running around every few months. What really made me almost run to the vet and have them fixed was when I read about the health benefits wen you DO have them spayed and neutered. You are cutting their risk of getting mammary, ovarian and testicular cancer by 100%. If that isn't enough to make you want to do it, then I don't know what will convince you.
I've said it before, I would loved to have seen the kittens my Vlad and Oksana could have had, but Oksana is a small kitty. She's very petite, and I could never have put her through a pregnancy. She's just too small, and I'd never in my life forgive myself if anything happened to her while giving birth.
Thank about it. Can you have your pet's life on your conscience if something went wrong?