Gender-Ultrasound 13.5 Weeks

"The gender for a boy or girl is fully develpoed after 20 weeks all fetuses are boy gender till then."

Okay, I had to quote that from another poster... so, you truly think that before 20 weeks, they all have XY chromosomes and it magically turns to XX at 20 weeks for a girl? I hate to tell you, that is not even almost the case. 20 weeks is generally considered the benchmark for easily identifying the gender - but they are not all male before then! all 3 of my children were predicted(accurately) by my high risk OB at around 12 weeks. he did say that b/c of the small size of the babies, he would be more confident in his "guessing" later - but he was right with all three of mine :)

The gender for a boy or girl is fully develpoed after 20 weeks all fetuses are boy gender till then.

Well not the exact same thing but with my first i had some complications and I had a ultra sound at 11 weeks and the tech said she couldn't be for sure but she thought it looked like a boy. But once I had my next ultra sound at 19 weeks it turned out i was having a girl! So she was wrong but you are farther along then I was so maybe you are having a boy. Best of luck.
I just found this website that might help you.
http://www.baby2see.com/gender/external_genitals.html

It's very difficult to tell prior to 17 weeks. What you saw was probably the umbilical cord or something else. I had ultrasounds at every appointment with my twins, and it wasn't until 17 weeks that the doctor could tell that one was a boy. The other wasn't positioned right until 21 weeks, so we couldn't even tell on both anyway.

Yeah, it's the angle of the dangle theory lol. I had a sono at 12 weeks and the guy told me, oh it's a boy and showed me. (I still have the pictures on my comp if you want to compare) anyhow, i got another at 18, 22, and 30 wks. All boy. And when he was born, definantly all boy :) so, it's a shot in the dark, but it's fun to guess.