Fragile X and liquid in kidneys??

My hubby and I went to Maternal Fetal Medicine today to do our anatomy ultrasound and get genetic counseling. We found out we are having a boy! Doctor said everything on the ultrasound looked good but our boy is holding onto more liquid than he should be in his kidneys. She said it is a fairly common issue at this stage and isn't necessarily cause for alarm. We have to go back at 32 weeks to see if the problem has been corrected. Then, because I have a cousin who has a son with Autism, they suggested I do the test to see if I am a carrier of Fragile X syndrome.

All this news kind of freaked me out today because, like everyone else, I just want my baby to be healthy.

Anyone have experience with either of these things??