I did one since I'm adopted and so is my husband's mom since we don't have accurate family histories. it's not a big deal and your OB can figure out an excuse for insurance to cover it. They don't do it until 16 weeks.
where I'm at it's called the maternity 21 I've had it done with my last & this time I had one done that wasn't as in depth as that one that one told us gender & all the one I got this time just checked for down syndrome & trisomy 18 & a couple others I cant remember