Gender Testing

So I had about 8 capsules of blood draw today for genetic/gender testing. I’m a FTM and a little younger. Just curious how accurate this finding out the gender by the blood is ? They said in 72 hours they’ll have my results. I’m 12 weeks. I had my first ultrasound at 6wks. I don’t have another appointment until the end of May and they canceled my next upcoming ultrasound because they said it’s “non-emergent”. So I probably won’t have an actual ultrasound until like April or later!! :(