No to my knowledge you should be at no added risk next pregnancy. Often bad Polyhydramnios is picked up earlier then that. Do you know how much fluid there was (like 2L or much less or even more?) Uterus's are usually pretty stretchy. Shouldn't be any damage from simple being overstretched. With extra fluid there is not a great risk of uterine rupture as usually if anything it will cause your membranes to rupture if anything. Did you have a vaginal birth or C/S? Often the cause can not be identified. I would say your pretty safe and if next time your worried the dr should be able to order a later ultrasound like at 34weeks or so to rule it out.