Yeast Infection? Yes... No?

I’m going to see my physician tomorrow... I have an IUD, so at first when I felt discomfort I thought it was that. But then I noticed: swelling, itchiness, and a smell. I seems like an infection and nothing IUD related at all. I checked and there’s nothing up there even though it feels like there is a tampon? I’m concerned and just hoping it’s all good. It’s just highly uncomfortable. Thank you ladies!