The only thing you could do at a water park is get in the pool or a lazy river. No slides no bumps or rapidrides.
Yes. You must not try all these craps. My cousin enjoyed a lot in water park. Next day she had a miscarriage.
A good water park will have signs saying which things aren't suitable for pregnant women. Don't go on the slides. It isn't worth it
You really shouldn't. But the lazy river would be fine just make sure no one bumps you