Vasa previa?

Julia
I'm a ftm. I just went in for my 20 week anatomy scan and found out I have vasa previa. I am totally freaked out. I am to see a perinatologist in a couple of weeks. Has this happened to anyone? Is there any advice that I can get to calm myself down and hope that everything will be ok? 
I also found out we are having a BOY!!!! So excited!