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This is Dr. David
antibiotics can cause diarrhea and can kill off good bacteria in your bowels, your vaginal canal which can lead to vaginal yeast infections.
best to always take a probiotic pill to add back good bacteria into your bowels while you are on antibiotics to prevent diarrhea.
I would hold off on the diflucan and watch for signs of vaginal discharge and vaginal itching which can be a sign of vaginal fungal infection
you might not get a vaginal fungal infection.
if you do get one, you can always take the diflucan at that point.
let me know if you have other questions.