I think it would depend on how far along you are during the trip. I went to the world when I was 13 weeks pregnant and rode everything. I did ask my doctor first, and she said that early on there would be no problems. I say ask your own doctor as well, but if they say they see no problem with it, then go ahead and ride the rides you want (FYI I had a very healthy happy boy 6 months after that trip!) Truthfully, you have more of a chance of something happening because of a bumpy car ride (seeing that you most likely are in a car every day of your pregnancy) , or the take off and landing while on board a plane than you would of something happening on pooh, or splash mountain.