Hi I have had extra fluid with all with pregnancys but with ds3 I was confirmed with polyhydramios my fluid level was 28cm at 38 weeks!
No problems with any of my boys (ds3 has hypospadias but was told the higher fluid was not to do with it seeing as I was carrying extra with each of them, the only reson they checked fluid levels with ds3 as he was a tad smaller than my other two but all was cleared no kidney or bladder problems he was passing urine normally as they kept an eye when he was born to see what when and how much was passed.)
I cannot give birth naturally so was careful of each niggle etc as can go into labour from the extra amount of fluid I always had niggles and sometimes random contraction but ds3 stayed put until his scheduled date.
I was strapped to a machine a few days before ds3's arrival as with extra fluid I couldnt feel all his movements and contractions now and then Would be picked up, I think they said i had a grumbly uterus and if they intensified or became regular then to pop down to be checked otherwise just to keep doing what I did normally.
I have 3 healthy children, I just looked like I swallowed a huge beach ball carrying them lol.