10 week blood testing

Jess • 24 years old. Wife. Christian 👼🏼 2/28/19 ♥️ 3/28/20 👼🏼 ♥️ Due May ‘21 ♥️

I’ll be having my first appointment and ultrasound at 10 weeks. I’ve heard they usually do the Rh factor test at this appointment. If they do that, would they also be able to know the baby’s gender from that test? What’s the deal with that?