I've come over to the US for a two week holiday to my partner's family. No problems at all in this pregnancy (my first). Then yesterday morning the waters broke! I've been admitted to a local hospital and although me and baby are fine we'll be here for the duration. It's likely to be three months! Baby could come any time between now and full term so we're keeping everything crossed (including my legs of course) it stays in as long as possible. Either way we're not able to fly home for a looong time...
Our baby will be coming back to the UK an American citizen - how about that? 
Pray the insurance works out for us!!