Hi for the last couple months i have had on again off again yellow discharge that comes randomly only has happened 3 times since i first noticed and avout 3-4 weeks in between each discharge. It only happens when i milk it. Been to docters each time it's happened ran std tests and all negative and swab for bacteria came back with nothing. Just looking at suggestions at to what i should do next? Or if maybe its normal. Thankyou. Any answers will be appreciated