Hi Tara
Re your fundal height - I heard that it can depend on exactly where your bellybutton is located in relation to the rest of your anatomy - some people's can be higher or lower than others. Maybe you're also expanding faster as it's not a first pregnancy? I'm sure your Dr would have said something if it was something to be concerned about but why not give him/her a call to set your mind at ease.

I know a number of people have not been able to have gender determined at their morphology scan due bubs positioning and others who weren't able to tell with any level of certainty. I see this is important to you but maybe you need to weigh up which has the higher priority - getting the fluid checked sooner rather than later or trying to find out the gender. It would be really sad to see you continue to worry about your fluid levels whilst hanging out for the later date which may or may not deliver the news you're after.

Re cost - is there a hospital clinic you can get your tests done at rather than a private u/s provider?

Hang in there!