I have a 3D/4D (I don't really know the difference) scan this Sunday! I will be 13 weeks 3 days. The tech said they should be able to tell the gender and even guarantee it at 14 weeks. If for some reason they can't tell they will give me another scan at 14 weeks fo free! It only cost $35 to begin with. I'm so excited! According to the nub theory it's a girl so I'm also excited to see if that's actually the case! Wish me luck!