Wouldn't have bothered me, but no, I personally wouldn't wear one (not even without being pregnant!)
I, too, was at a water park yesterday.
Here are some things I saw:
cellulite of all kinds, both on large and small women and men
men in teeny speedos
well endowed women in maillot type swimsuits with no supprt (shelf bra, underwire, etc.)
women in thongs
men with thick carpeting of hair on their backs
extremely obese people in skimpy, unsupportive swimwear
kids allowed to run around naked
very young girls (ages 8-14 or so) in teeny bikinis, some on very well endowed girls (too many hormones in chicken these days, I swear!)
a woman in a long sleeved shirt and capri pants swimming in the wave pool
men with severe gynecomastia
and the one that really really really bothered me:
4 teenage girls (maybe ages 13-14) being obnoxious in the park- sneaking in beer, one talking loudly on her cell phone to her boyfriend the entire time on line for a ride, all in teeny bikinis - one was pregnant. Seeing such a young girl pregnant and acting with such little regard for the world around her really upset me.
Some of the other things caused me to look twice or to giggle or to wonder to myself,but they didn't really get to me.