Could i take fluconazole(diflucan) to prevent a yeast infection?

I would not: I would not take Diflucan (fluconazole) if i did not need it.

No: Fluconazole interacts with many medications and therefore should be used only to treat active infections unless a patient is immunosuppressed. Yogurt with active cultures or lactobacillus acidophilus supplements can help some people prevent yeast infections especially during courses of antibiotics. Also keep yeast-prone areas dry by using zeasorb or other powders over the counter is helpful.