17 weeks. But my doctor will tell you from 15-20 weeks depending on when your appt falls. So if she said boy I'd count on it but if you're going to buy stuff I'd say weight until confirmed but start picking out boy names.
I'll be 21 weeks when I find out! Come on June 23rd!!
I was 22 weeks when I found out that im having a little girl
I was 16 weeks so if they told you ur baby was a boy most likely it is a baby boy :)