first ultrasound gender prediction myth?

Has anyone else read that you can tell if it's a boy or girl by the placement of the placenta from the first ultrasound? 
The things I've read say that if the placenta is on the left, it's a girl, and the right, it's a boy. 
Anyone else heard of this? And if so... anyone guess correctly based on this? I'm so anxious to know but I'm only 10 weeks! Just curious if anyone else has had success with this "guessing" approach 

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