So you're saying the caveman would have chosen to ride the roller coaster?
Yes. Well they wouldn't have chosen it. And it would have been call something like "Avoid the Sabertooth" or something like that.
Point is, that's what we're built for. If a tumble down the side of a steep rocky hill was a death sentence for the unborn, we would have died out as a species 60,000 years ago.
Here's a thought exercise:
1.) How much risk does going on a bumpy ride add?
2.) How much risk to your pregnancy is the right amount of risk?
For question 1, you can't tell. With a team of doctors, scientists, and statistical analysts you would come up with a number something like, it increases chances for a problem by 0.01%
Question number 2 is deceptive. It's easy to say that you want zero risk. But that's a rabbit hole you can get trapped following. I mean that risk is the cost of reward. If you actually strive towards zero risk to your pregnancy you will be miserable.
There is risk to your pregnancy from going for a leisurely swim in the hotel pool. I would entertain that a drive through some neighborhoods is far more risky to your unborn than a ride on splash mtn. Some shoes are less likely to trip you and so present less risk to your pregnancy. You probably have an diagnosed food allergy or intolerance that poses some risk to your pregnancy. Eat a lot of veggies and trace pesticides add risk, go organic and you get more risk from things like spinnich with salmonella.
But even if you add up all of the risk that you have any control over, it still represents the tiniest portion of the total risk of developing a problem pregnancy. The lion's share of that risk being basic human design.