Gender blood test?

M • 💍🐶👶🏽🎀👨‍👩‍👧💕
I keep hearing all these moms saying they found out the gender as early as 10 weeks because of a blood test. I asked my doctor and lab tec at my first blood draw, and they had never heard of it. Can anyone help me out here? I'm 12+1 and really want to know the gender before Christmas!!