I have only ever had a yeast infection once in my life so far and I was not pregnant, but I did boric acid capsules and it cleared it up within a day or two. I am not sure if boric acid is safe during pregnancy, a simple Google search could answer that probably. You have to buy the boric acid and capsules seperately and fill them yourself, it's very easy. Just another option for you if you wanted to avoid the meds.
Thanks for the suggestion. I've had success with boric acid in the past, too, and a midwife did tell me it was safe during pregnancy a few months ago. But the only place I have been able to find boric acid here in El Salvador sells it in unmarked bags (I think they get it bulk and then divvy it up), which makes me nervous about knowing that it is pharmaceutical grade since it is also sold as an insecticide (I couldn't get a convincing answer about the grade from the vendor). I've already started with the fungicide the doctor gave me, so I think I'm just going to continue...but I'm promising myself that if the yeast comes back after this 3-day treatment, I won't do the medicine again but will stick to natural remedies even if that means just controlling but not curing it for the rest of the pregnancy.