Yeast Infections an early sign?

So I NEVER NEVER EVER get yeast infections, like ever. My fiancé and I DTD almost every day during my fertile window and a lot at that. Now my boobs and nipples are extremely sore and I had some slight cramping. However now I have a yeast infection. I'm curious if this could be an early sign of pregnancy or not? Has this ever happened to anyone? Don't know if it's just bad luck that I have one or if this could be a sign! Anyone???