My daughter's best friend had this with her first pregnancy. She ended up with several months total bed rest and a C section. It was all a bit of a nightmare at the time, the baby was early and she was lucky not to bleed to death, but they both Survived and she went on to have a perfectly normal second pregnancy, although she found it very strange to be able to do things like gardening instead of lying in hospital.
I think the secret is knowing about it early on and being able to plan ahead. DD's friend was in the USA so I don't know if that made any difference to her treatment - apart from the worry of paying for it all!
It's a worry, but forewarned is forearmed and I have rather more faith in our hospitals than I do in some of the american ones I have read about.