Blood test gender reveal?!

Haley • 25 yrs old, married, 3 year old daughter 👧🏼 Angel baby 👼🏼 and currently expecting our rainbow baby 🌈💕💙
I've been hearing about everyone taking a blood test that can tell you the gender of your baby. I ask my doc office about it. They seemed clueless and told me they don't do that there and I'd have to go somewhere else for that. Where in the world do you go if not your doc office and how far along do you have to be? I've heard 11 weeks... ?