See now I wouldnt mess with it, you would have to be testing the acidity/alkalinity of you cm all the time, eating certain foods could sway it one way or the other, antibiotics does the same, whole list of things could affect it, it would have to be so far off the acidic chart to be killing off all your little guys and if it was you would have other problems to contend with health wise if that was the case. Whos to say it just was her time to get pregnant and just happened to use baking soda? Ive read posts on other forums where they say, I used blah and then got pregnant, but for every one person there is a whole heap who didnt, its just mostly coinsidence. Just my opinion, but I wouldnt mess with my bodies natural chemistry unless its proven to have something severly wrong with it! Baby dust to you all ladies!