How early can you find out the sex?

I was told at 15 weeks that I was having a boy.  My amnio said otherwise.

my MD did the down syndrome nuchal US at 13.5 weeks...come to find out the baby was measuring larger so they were unable to do it...instead the little peanut was about 15 weeks... so at that time he told us its very very very likely...like 95% that we are having a girl...but we will have the anatomy scan in another few weeks...which will confirm.. good luck to you.  a 4d US should be able to tell now....except places around here wont do them until your 16 weeks. 

i found out at 15 weeks. they say 20weeks is the best though

I had my scan at 15 weeks. He was all boy and never changed. Good luck.