3D ultrasound?

Shelley • 👨🏻🤰🏻🌈👧🏻👼🏻👼🏻🐶🐶🐶🐱 Currently pregnant with my rainbow baby boy, after a loss at 10 weeks 2 days and a second loss at 17 weeks.
When is the best time to have a 3D scan done?