doctors wont send you until your 20 or over. Depending Where you live and your doctor. Some might at 18-20. Mine is scheduled in 3 weeks when Im 20 weeks and 3 days i think ill be then. I cant wait either. However the ultra sound isnt for the sex of the baby its too see the development I just made sure to tell my doctor i wanted to know the sex so she sends me to a place that WILL tell you the sex if you want to know otherwise a lot of places esp hospitals will not tell you for law suits ect