I don't know about anything specific, but if you're asking about what you can and cannot ride, I know my doctor said it's mostly the abrupt stops that are the risk. IE, ToT is a big NO, but IASW, no problem. My doctors told me to use my best judgment when I asked before we went to a coaster park here.
It's much better than following their signs. They said on the sign at the water park here that our Lazy River (the one where you sit on a tube and just float, no drops or machine or anything) is off-limits to girls who are pregnant! We were like "Um, no, I'm going on it anyways".
Just talk to your OB and use your best judgment. But, yeah, they just said, if it has an abrupt stop, it's out, because it can cause the placenta to detach from your uterine wall.