Yeast infection?

I've never had one before and it's a pain to get into my dr plus they keep giving me a midwife & she's really unfriendly to my questions and concerns, but I'm pretty sure I have a yeast infection. What can I use and what's everyone else's experience without having to go to a Dr? I'm 15 weeks but haven't had sex since Aug, if that factor matters any. I did get my results last week that all my pap results came out negative for everything though so it's definitely not std etc.