I am very upset, does this sound like Parvo?

[FaerytFantasy]

I dropped her off at the vets, they said it would be a few hours before they could get to her and test her, so told me I could leave her and run a few errands right now. First, I thought this would be considered an emergency situation?? She is a pomeranian, and very small. She has had her first set of shots, but was not due for her second set yet. Does the first set not prevent Parvo? My husband's mom sent her 6 month old dog here that has been fully vetted and vaccinated. The dog was very lazy to us, and her feces smelled horrible and had blood in it. We sent her back and told her she needed to be seen by the vet. This was 2 days ago, and now my puppy has started vomitting and is very lethargic. Her little tail and ears are normally up and perky and now they're down and her hair is standing up, she looks horrible. A friend of mine had a puppy die of Parvo a few years ago, and she has gotten me convinced she has it. I am a nervous wreck waiting on the vet to call. Does this sound like Parvo or just a stomach bug maybe? I have heard most puppies with Parvo don't make it, I am very upset over this. I haven't had her long but she's already a part of the family and I have become quite attached. The receptionist said she can't tell me anything until they run the tests. I know she doesn't want to freak me out if that's not what she has, but I just wish someone would prepare me for what's about to happen. Can someone please help? Does this sound like she has Parvo, and would she have caught it from my MIL's dog?