Is there any truth to this kabalistic urban legend?

Here is the context of the urban legend I speak of here: Two yeshiva guys just ate dinner at their Rebbes house.

Hey Moishe- how many Kids does Rabbi F. have?

“Ten and 9 of them are boys”

Good for them, you know what that means (said with a smirk and an evil laugh)

It is known at least amongst my friends and I that- if the women has a boy she climaxed first during when the child was conceived, but if she had a girl- she didn’t.

All I seek is the truth- Is this some kabalistic urban legend, so people can speculate about each others sex lives?