Hi Bethaliz, given the current situation with Roxie, I think it's time you find another vet. While the vet tests have proven nothing, your concerns over what you consider to be abnormal prove EVERYTHING. Find another vet, either by talking to someone else you know and trust, or by networking with your breeder (regardless of state of mind) to find out where her other puppies have gone and contact those folks for vet info. If you're concerned enough to join a
very pro-spay/neuter forum, then your dogmommy senses are tingling and need paid attention to NOW. And as an aside, if something proves to be abnormal, then please get her spayed so further complications don't occur and put your baby at risk
Hopefully you continue to visit here, and keep us posted on how she's doing