Chinese gender prediction

Jade
Has anyone used the Chinese gender prediction calendar and got the correct gender?? I did it and two of them said its a girl!! Somebody do it for me and check behind me, I was kind of confused. I was born May 7, 1998. I was 18 when I conceived. My due date is March 15th, 2017. (Idk what day I conceived. But my last period was June 8th)