I feel for you! yeast infections can be miserable. I am, regrettably, the queen of yeast infections. I got my first one before I could drive because I was taking antibiotics for tonsillitis.
Now, I am NOT an interventionist about almost anything. I refuse almost all tests (including GBS and any pelvic exams), treat as little as possible (no eye drops or vitamin K), etc. etc. However, I assure you that the best way to get rid of a yeast infection (and many times the only way) is to get meds--they are not anti-biotics; they are anti-fungals. Antibiotics kill bacteria. Anti-fungals kill fungus (including yeast). I had a bad yeast infection while pregnant with DS and it took two rounds of anti-fungal cream. The doc gave me a RX, because at the time my insurance would pay for it, but you may be able to just get an over the counter meds, but it may take more than one round. I have had to take more than one round on more than one occasion.
I take probiotics religiously, and they help prevent yeast infections (infections are caused by an imbalance in the mix of yeast and bacteria in your vagina, and pro-biotics are just bacteria that is naturally found in your gut and vagina, but you are supplementing with a little extra to restore balance), but once that yeast is "overgrown" as it were, probiotics for me and many others are not enough. If I had a yeast infection today, this is what I would do: (1) use an over the counter cream (if you used Monostat last time, use Lotrimin this time or vice versa), (2) ask your health care provider for a RX for Diflucan, (3) start taking pro-biotics religiously, and (4) take baths with vinegar added to the water (vinegar has a PH level that is not hospitable to vaginal yeast). As you can tell, I am all about aggressive intervention!
You do NOT want to have any yeast infection at ALL when baby is born, as you can end up in a nasty thrush battle.
So far as I know, there are very, very few risks (I know of none) associated with using anti-fungal creams, suppositories, or oral meds. Diflucan is usually very effective, and is taken orally, though it often takes longer to take effect, and could require two doses.
Good luck getting rid of those yeast devils!