Potential Yeast Infection?

Hello, I’m sorry for the TMI, but I can’t see a gyno because of the corona stuff so I’m asking here.

For maybe the past 3 days I’ve had cramps, white chunky discharge, and a little bit of a smell? I’ve never really had a yeast infection but maybe that’s it? How do I know if I have one, and what can I do to get rid of it over the counter? Thanks, sorry again!