This might sound crazy but in all of my pregnancies that resulted in the birth of daughters, I was eating tons of tomato products before and around time of conception: tomato juice, spaghetti sauce, tomato sandwiches. I was convinced with my last pregnancy due to timing that it must have been a boy( had sex day of ovulation) but had a girl. I am convinced it was all of the tomatoes I was eating. I think it must create a hostile environment for male sperm.
Good luck, I hope you like tomatoes :)