Ever since I had my 13 week ultrasound I have been obsessed with the theories behind gender prediction! My husband teases me for looking at random people's ultrasound pictures and doing weird science experiments trying determine what we are having. He doesn't want to find out and at first I didn't but now it's driving me crazy haha. My 20 week ultrasound is scheduled in 3 weeks. In the mean time, any guesses on my 13 week 0 day scan? Heartbeat was 150.