I don't think there's anything wrong with using Miracle-Mineral-Supplement before you get pregnant (even though I'm not sure it's a good idea WHILE you are pregnant). I am also hoping to get pregnant in the next couple of months, and I have been taking a number of supplements in preparation. Since Miracle-Mineral-Supplement just kills pathogens, I don't imagine it is going to bother vitamins or probiotics - but I always take them 2 hours after the Miracle-Mineral-Supplement , just to limit the chance for any interference.