13 week gender US appt

Magdala • STM. Baby boy due August 2019.

I'm 12w6d days tomorrow marks my 13th week and I also have a ultrasound scheduled. My OB told me we're going to "find the dates" and gender. I didn't know the gender could be found before 20 weeks without the blood test, anyone find their gender via ultrasound before 6 months ?