Monthly yeast infections

Ivey • Married 6/11/2016 ❤️ Childless Not By Choice 🌸 Mom of Fur Babies 🐶🐱
I get a yeast infection that starts right before I get my period. And I mean, I notice slight itching days beforehand. However, I have to wait to treat it because if I don't, my period will come and I'll get another infection. So since I'm all about saving money, I wait it out. 
But the weird part is that this happens every month. I went to the OB/GYN to get everything checked out and it was all fine. Standard and transvaginal ultrasounds turned up fine and I've never had an STI/D. Always tested negative. She said it was normal, but I feel like I'm the only one who has this issue. I've never known of anyone else who does and there's not much online about it. 
Does anyone else have this problem? If you have, have you been able to keep it at bay? If so, how? I'm so tired of itching so bad every month.