Medical standard for u/s is 20wks. For mothers of multiples, early u/s... like 17wks... is literally a life saver. It saved my boys by diagnosing them with TTTS. Not to scare you, but just to inform you that you could find out genders in 2wks and have medically justifiable cause ;) to have earlier than standard u/s. Best of luck with your babies.
