I didn't go to WDW pregnant (because I've never been pregnant) but I can give you an article in brief in the Unofficial Guide written by a pregnant Unofficial Guide reader from Colorado.
Don't ride:
Splash Mountain
Big Thunder Mountain Railroad
Space Mountain
Tomorrowland Speedway
Body Wars
Test Track
any other simulator rides
Mission: Space
Tower of Terror
Rock 'n' Roller Coaster
Dinosaur
Primeval Whirl
Kali River Rapids
Any slides at water theme parks
Also, Mad Tea Party is safe if you don't spin the cups. Backlot Tour is questionable, (if it's open when you go). Yet, it's really tame compared to Earthquake! at Universal, which posed no harm to the reader.
Hope this helps!