Is this normal? A week after my period my vagina smells/ tastes sweet

No stds. No sour smell/ taste but its sweet. How do i know? From having sex and sucking his dick during. Its not a bad smell or taste but its slightly sweet. After sex i told him it smells kinda weird and he had no clue what i was talking about, and told me no multiple times. Is something wrong? Should i be drinking more water?

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