What week for gender?

Amber 🐾🍸🍁 • Aidyn's Mommy
We had our first ultrasound the other day, at 13 weeks. When I asked the tech if 16 weeks we could determine the gender she said that was way too early and she suggest 19-20. I'm so bummed! For anyone who had it done at 16 weeks, was it totally accurate?