Gender ultrasound at 15 weeks

Hi! I'm 15w2d and I'm doing an ultrasound to find out the gender of my twins. My hubby is convinced it won't be accurate until 18 weeks. This is a special ultrasound place that basically only does gender ultrasounds. I wanna hear from twin mommas who found out the gender at 15 weeks. Was it accurate for you or did they get it wrong? I'm pregnant with Di/Di twins btw