TMI yeast infection???

So this is definitely going to sound gross but something's been wrong with my vagina for a little over a week and it's freaking me out. Randomly I started getting a LOT of whiteish watery discharge and it smelled pretty awful. I'm a very clean person but no matter how many times I washed it won't go away. Is it from having sex and my bf cumming in me? Could it be a yeast infection? I feel so gross