Yeast infection- prego?

So i think I have a yeast infection. I researched on it & am just looking for what others have to say. I'm aware they are very common and I just noticed it last night. I've been having sex frequently in the last two weeks or so. We used protection & tested every condom we used. There was one time that it slipped off in me when he pulled out but he hadn't came and used the restroom before we started. I know it can be due to hormone imbalances. I have used a plan b a couple weeks ago as well. So I'm just wondering what I should do, how to prevent it and if I should be worried about pregnancy at all? Please let me know, it's much appreciated! :)