Ob-Gyn questions? Ask a gynecologist online.
You should try RepHresh Pro-B. http://www.rephresh.com/RepHresh-Products/RepHresh-Pro-B/Reviews/
The ingridients are L. rhamnosus GR-1, L. reuteri RC-14, Dextrose Anhydrate, Gelatin, Potato Starch, Microcrystalline Cellulose, Magnesium Stearate, Titanium Dioxide. Potato is gluten free.
If you have UTI after sex, it is due to contamination from the vagina to the urethra. You should take antibiotics immediately after sex.