im currently 19 weeks 4 days pregnant. My husband and i want to book an appointment for a 3d/4d ultrasound. Should we get it when we are 27w6d or 29w6d?? i wanted it at 28w6d but that falls on thanksgiving weekend so they are closed. Can anyone help me decide which week would be best to have it done?? Better results on the pictures?? Thank you in advance.