Is there a source to the Segulah for an infertile woman to bathe in the Mikva water immediately following the bathing of a pregnant woman in her 9th month?

Shalom U'verachah, I have never heard of such a Segulah, but I have heard of women who want to conceive going to the Mikvah after a woman who has just given birth, ie. the first time that she goes to the Mikvah after her birth. Kol Tuv