choroid plexus cyst

Just had my 20 week scan. Found out we're having a bouncy baby boy! Everything looked normal - baby even measuring big (14oz) for 20 weeks. They did see one cyst on the brain which they called a choroid plexus cyst. Doctor said this doesn't affect development and most go away by 28 weeks. However it can also be a marker for a chromosome abnormality.  I went ahead a did a blood test screening. But I can't help it I'm panicking! My nucheal translucency was normal at 12 weeks and everything else looked normal at 20 weeks besides that cyst. Has anyone ever had this happen?? Help calm this momma down!!