Soarin' doesn't have any warnings that would affect pregnancy - just motion sickness and fear of heights.
Toy Story Mania does not have a warning either. It does make a fast spin and short trip each time you change to a new game station. it can be a little jarring, but they have no warning on it.
You can look at the park maps for the attractions with warnings - they are marked with a red triangle on the map and also on a sign at the entrance to the queue.
For
Epcot here are the attractions with warnings:
- Mission Space the sign outside the attraction says that pregnant women are advised not the ride both the more tame (green side) and the more wild (orange side)
- Test Track
For
Magic Kingdom:
- Splash Mountain
- Big Thunder Mountain Railroad
- Tomorrowland Indy Speedway (probably for being hit into by other drivers and also because of the gas fumes from the car's smelly gas engines)
- Space Mountain
- Goofy's Barnstormer (this doesn't have a triangle warning sign on the map, but does say that pregnant women should not ride)
For
Disney Studio
- Star Tours
- Rock N Roller Coaster
- Tower of Terror
For
Animal Kingdom:
- Kilimanjaro Safari
- Kali River Rapids
- Expedition Everest
- Primeval Whirl
- Dinosaur
The Safari and Kali River Rapids are listed because you can get unexpected hard bumps and drops during the course of the ride. Many people suggest that the Safari is less bumpy closer to the front, but it is still bumpy. We sit in the front seat because youngest DD needs to stay in her wheelchair; we still get bounced around a lot. It all depends on which ruts your ride car hits. I have also ridden it without DD, and have found the front seat is about as bumpy as the farther back seats (unless you are talking about the back 1/4 of the tram).
G forces are the reason for not riding Splash Mountain. The big drop takes you down at a very extreme angle at a high rate of speed (I think you get to 40 mph). At the bottom, your ride car stops abruptly. That sort of combination of fast speed drop at an extreme angle and then abrupt stop can theoretically cause placental abruption - where the placenta actually peels away from the wall of the uterus. That's the main reason for warnings at Splash Mountain.
For rides like Dinosaur, Star Tours, Test Track, Big Thunder Mountain you are not moving that fast, but experience sudden changes of direction that jerk you around a lot.
