CVS genetic testing?

Kristina • In love with my life ❤️ perfect man. adorable little boy. and a little bundle in my belly :)
My doctor offered us to get this at no cost ( insurance covers it) we are at no risk family history wise but just thought it'd be nice to finally get an ultrasound and see baby. Doctor never explained the procedure and our appt is on the 23rd. Well this morning me and my SO were doing some reading and now we're freaked out. Anyone have this done?