Is it ok to take 10-20 billion live cultures for my gastrointestinal tract, and douche with a probiotic to maintain balance?

No. Please don't use probiotics for your GI tract, in your vagina. The "good bacteria" strains in each area are not the same. There are specific vaginal suppositories which can be used, if desired and appropriate. Please talk with your ob-gyn doctor about this.