Genetic testing

Kylee • Mommy to a little boy💙
When I got my blood work done for genetic testing almost a month ago, the lady taking it told me you can also find out the gender that way. Was she right? She told me that this blood work is the one you compare to your 20 week one but the first draw is the most accurate. 
I called my midwives and they just told me "not to fret we will have the confirmed result in a few weeks waiting to have the second draw done to compare to."
Mind you they left this in a voicemail when I had other questions too. 
They have my next ultra sound scheduled at 22 weeks.......
Other mommys have found out at 15!
I'm 15 weeks and 6 days!
Any advice!?