At my 12 week ultrasounds I asked the tech if it was truly possible to tell the gender this early. She said it's not impossible because both genders have the same genital tubercle at this point (also know as the nub). She said she was getting a a clear photo of the nub and I suggested I search the internet for what that means. Of course I immediately did. The theory (as illustrated below) is that if the nub is at a 30 degree angle-- it's a boy, if it's more horizontal-- it's a girl. Apparently with 98% accuracy. After studying my ultrasound photos very intently I still don't feel like I can tell. You have to measure in relation to the spine, which tilts, making it tricky. I don't feel like it's totally horizontal but I don't think it's quite a 30 degree angle either. I'm hoping you guys can help me. Anyone have a protractor? What do you think? Let me know! :)
The Chinese calendar says it's a girl. We'll find out for sure at the end of July.