Defenetely vagina infection most of the times is related with yeast infection, as that's the perfect environment for candida to thrive. I had that experience long time ago, and I realize there was something wrong as I started having accute sore throat, that lasted for a long time, but at that time I didn't know it was Candida infection. It doesn't mean that you will get Candida infestation right away because of that as most of the time our immune system keep candida checked, although I will recomend you to do gourgues with any antifungal, such as Grape fruit Seed extract, wild oregano oil, or any of the others, just to help your self to get rip of it. Also refrain for oral sex till your girlfriend get rip of it, it is no worthy to jeopardize your health and overall your digestive track just for a couple of minutes of pleasure, I know that sometimes it is not easy but dude is your health.