I had a yeast infection around a month or so ago and took cream to get rid of it. My boyfriend and I had stopped having sex during that time because it was really irritating and since taking the cream and my symptoms going away, we've continued having sex. However, it seems as if I have another infection and I'm wondering if he could have been infected and now we're passing it back and forth? He has also had bad canker sores the past month, which I know have to do with yeast, but I have not received oral sex from him--can this still be a sign that he is carrying the infection and giving it back to me?