I got to know an Italian woman who came to Galway for a weekend in 2007, when she was 24 weeks pregnant. She went into labour at 24 weeks +1day and had a baby that weighed slightly over 1KG. The mum only had a backpack with her.
Her daughter remained in University Hospital Galway for 4 months before being transferred by Air Ambulance to a Hospital in Germany (where she was living with her German husband). The baby spent a further 2 months in a specaialised neo-natal hospital, which was 200km from their home. Sixteen months later, the baby is doing well, thank God.
I got to know this lady because my wife also had a premature baby 12 hours later (born at 27 weeks). It is our 2nd baby and despite a few scares, he is fine now. Our first child was not born prematurely so don't asume your 2nd pregnancy will be in any way similar to your first. No two pregnancies are the same.
The only reason I am telling you this is so that you are aware of the risks. Staying is a hospital in USA is many times the price here and check the small print of your travel insurance very carefully. I do not want to scare you but I couldn't ignore your message.
We only got 8 days notice that there were complications in the pregnancy before out beautiful son came into the world, albeit 13 weeks early.
I suggest that you log onto the excellent Irish parenting website
www.rollercoaster.ie and look at the message boards there.