H.M.
Speaking as both a pediatric nurse and a parent of a child with multiple heart defects (but otherwise completely healthy! 2 1/2 years old and has been through 2 cardiac catheterizations and numerous tests/visits, but completely normal otherwise!) - I just wanted to give you my recommendation for Children's Memorial Hospital (I see you are in Chicago). They have some of the best cardiac surgeons (should the need arise) and will provide your family with excellent care.
Besides that, I also encourage you not to worry too soon! :) As others have already stated, some issues resolve on their own, others require no more than a follow-up with a pediatric cardiologist. Take it one step at a time, but I would encourage you to make sure that you are delivering at a hospital that also has great care for the baby (ask about the level of their NICU, do they transfer to Children's, do they have NICU specialists or pediatric cardiologists in-house at all hours, etc).
I'll be anxious to hear how things turn out! Don't hesitate to contact me with any questions, etc.