Boy/Girl - Do you know when you conceived in your cycle?

My friend is certain that the Shettles method of conceiving a boy or girl worked perfectly for her (sex on ovulation day for a boy, before ovulation for a girl). I’m just intrigued as to whether that makes sense for when you conceived your baby. I have two boys and I know I had sex on ovulation day for both of them, so seems to make sense for me! Would love to know your thoughts!

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