I?m curious?going in next Thursday for my 16th week appointment and there is a possibility I won't be getting an u/s L. Something about the babies not measuring but 15 weeks, 6 days then and they like to wait until at least 16 weeks to be able to clearly tell what the sexes are. How often did you receive u/s during your twin pregnancy? Of course, all of this information was from a nurse and I am a new patient. The doctor could order one?I don?t so much care about the sexes (even though I want to know) but I want to see them again!!