NIPT gender accuracy

Sooo, when I was 13 weeks I did NIPT blood test for abnormalities (everything fine) and it said we are expecting a baby boy...however, my doctor never looked for a weenie when having ultrasounds-she just said, the test said a boy, so it’s a boy. So, we never confirmed that via ultrasound...how accurate are those tests? Is it possible that I’m carrying a girl? Honestly it doesn’t matter as long as I have a healthy baby, but boyfriend and I were discussing possibilities, since half of babys clothes we bought are blue🙃