Discharge

Im in my third trimester and im having so much discharge. I went to the doctor because i thought i might of had a yeast infection since my discharge had a whitish green, no smelly color... every test came back negative to any sort of infection so im kind of at a loss here... Iv been to see two doctors, had my vagina checked and all and iv had blood tests drawn and nothing is indicating a problem... Everything about green discharge leads to an infection but nothng has came back positive... Have any of you ladies had weird discharge and no reasoning for it? could it simply be just the way that my body discharges?... my discharge color isnt always whitey green it seems to only b that color when i become hot and sweaty and i always know when that type will happen.. Uhhh so annoying