How early on a 3d/4d ultrasound?

Andrea • Married for going on 5 years, have 2 boys ages 9 and 5 and trying for our last, praying it's a girl this time lol
How many weeks do you have to be on a 3d/4d ultrasound to find out the gender?? I'm going to try and get an appointment for 13/14 weeks.