Oooh, so sorry about the yeasties, they are awful.
I had an infection in my 4th month and my gyn prescribed a traditional (ie not natural) yeast-infection med. She assured me it was safe for pg. (Looking back I now know that I should have tried other remedies before resorting to the drugs. Sigh.)
Unfortunately, the name of the drug wouldn't help you as I'm in France... But I assume they sell pg women yeast meds in the US too. Maybe you could go to a pharmacy and ask the pharmacist what they recommend?
Good luck, sorry this post was so incredibly unhelpful!!