fluid in my baby's kidney

I'm a FTM, 34 weeks with my baby boy💙 I'm due on January 18th but yesterday I was told I might get induced when I'm 37-38 weeks since baby boy only weights 3lb. I was also told that they saw a little fluid inside his kidneys. I'm freaking out and idk what to do, if I should worry or not. My Dr. Not to be worried but I can't help it😩 has anybody experienced something like this