You typically don't have an ultrasound after the gender scan unless the dr thinks there may be an issue. I'm 37 weeks and haven't had one by a dr since 18 weeks. But I did have an elective 3D done at 29 weeks
How much did the 3D ultrasound cost where you are? I am wanting to get one done when I get close to 30 weeks.
I'm in Oklahoma and it was $150.
I would call in and tell them you want o schedule it for around then because depending on the area they can be booked for 3D ultrasounds.
I had my last ultrasound at 20 weeks. I'm getting a 3D/4D one when I'm 31 weeks for fun ( my doc does them for free). So you probably won't get another unless you pay for it.