Pink SMELLY discharge

So please don’t judge me with this one. My boyfriend and I had sex while I was on my cycle. He did not pull out and now I’m having this light pink discharge that smells AWFUL! I think that my ph is thrown off. I’m not sure. Any recommendations or knowledge about this would be very much appreciated.

Also, I cannot even begin to describe the smell. It seems as if it could be fishy/metallic. Never smelled anything like it before