Harmony test?

Jessica • First time mom! Excited for our little boy too get here may 31st! 💙💚💙
I'm really thinking about getting this done. I'm not sure how it works really? My dr gave me two options one was that and I don't remember the other. My best friend had this done but she just wanted to know the gender. I don't care about the gender as its baby number one and I just want him/her to be healthy. Any insight would be wonderful! Thanks ladies! Btw I'm 12 wks today