Who has BV knowledge?

Julia
Forgive my ignorance here... I got an iud and let my boyfriend cum in me for the first time. I was lazy and didn't pee afterwards, and didn't know the cum would come back out, so it was sitting in me for a while. Later, my vagina REEKED of fish and I had a lot of white discharge (which may have been semen). 3 days later the smell is much less pungent but still there. From what I've read here, it looks like it could be BV. 
My question is: how serious is BV? And how urgent is it that I see a gyno? Is it like a UTI where you can chug cranberry juice for a few days and flush it out?

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