Probably they're okay... it's hard to imagine that one session in chlorinated water would do damage.
However if you happen to wear white gold rings, I would urge you not to wear them in chlorinated pool water, either. Years ago, when I was engaged, I was working at a therapeutic pool. I didn't realize that white gold is particularly vulnerable to damage from chlorine, and it wasn't long before the prongs of my engagement ring had become thin and had to be repaired.