L.R.
Yes, I had heard of it before. Until about the 1950s it killed more women and babies than we now realize; society has forgotten that it exists and is so serious. It bugged me greatly when people snarked (even here on Mamapedia) that they would have looooved some bed rest in a hospital for mere morning sickness. This is much worse and can be fatal. It's not often heard of now because it's much more treatable than in the days when it killed more people.