What Causes Bloating And Spotting?

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well yesterday i noticed i was feeling bloated, but i already had my menstral for this month. i went to use tha bathroom an when i wipped myself it was pinkish blood, like spotting perhaps.. so i put a tampon in, than when i used tha bathroom a lil later there whas nothing there when i wippd... what could that be? i already been to the doctors for my check up so i know i don't have any STD's are anything