Anyone ever got the gender wrong on your blood test?

Gabrielle

I have had 3 pregnancies since becoming pregnant now. My first was a boy. I miscarried 2 others one this last may and another December of last year. Is there anyway that the Materniti21 test picked up on DNA left from a previous pregnancy? I'm having a conformation ultrasound on monday. I just was wondering if my boy results could possibly be wrong. 😂😂 I know it's not likely just wondering if someone's was wrong lol