False negative NIPT?

Aly • Mommy to 🌈 👶🏻 born January 2017. MMC March 2016 👼🏻

I tested high risk (1/28) for my first trimester screen, so I took NIPT (harmony) and my results just came back as low risk. Has anyone heard of false negatives with NIPT? I’ve read that if your first trimester screen was high risk, there’s a higher chance of having a false negative. Thank you!