I'm 13+3 I would like to know the sex of the baby... My doctor said I have to wait for week 18, I did some reaserch and found a privare 3D-4D ultrasound office that says they can tell me the sex right now with a 95% certainty with a 2d ultrasound.. I'm just confused on why the doctor can't tell and this office can... Should I go or just wait? The fee is 50$ which is actually less then my doctor s copay but I am not sure if I should do it.. Suggestions? Have you done it?