I stink very bad on my period only, why?

Normally I have a regular vagina scent when I’m not on my period. It’s a scent NOT odor and it’s not offensive. But a day before my period starts I smell like fish, then once my period actually starts I have a strong pungent odor. It doesn’t smell like fish after that point but it’s an awful stench and leaks into my asshole and just smells real bad. For example I bent down in the store today and a guy covered his nose. I can admit it’s an offensive odor and I wash twice a day but the smell remains strong. I feel embarrassed and unclean. No matter how many times I wash I still stink but once my period ends I smell normal again.

It’s normal don’t worry
It could be BV
I have no idea speak to a gynecologist
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I stink very bad on my period only, why?
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