Discharge smell? please help..?

my discharge smells like fart. i take showers everyday and clean myself good down there. it does not burn when i pee , nor does it itch or red down there. i visited the doctor and she took a swab of my discharge and said it was fine. its really embarrassing and gross and it starts to smell like 20 min after a shower. does anyone know what this is and how i can treat it?