Yeast infection medicine to prevent

I’m on amoxicillin for a sinus infection right now. Every time I take amoxicillin I get a yeast infection, no matter how much yogurt I eat, water I drink, or probiotics I take.

I’ve been on it 2 days now and I’m feeling some itchiness inside my vagina. I was wondering if I could go ahead and use the yeast infection insert medicine to prevent the infection from getting worse? I don’t have thick chunky white discharge (yet) but I always get itching right before.

Thank you for any help!