Because you asked...I have
held dying puppies in my hands from a young mom (through no fault of her own) not able to birth nor care for them. The mom would have lost her life if it were not for extremely expensive and emergency surgery. I would never want to see another dog nor pup suffer like this ever
Only a vet will be able to tell you whether or not she is pregnant. When you come to a public forum for advice, that's just what you'll get, whether you like what you hear or not. Sorry.
that your dog (and her pups if you choose to go through with this if she is indeed pregnant) will survive.