White thick sour smelling discharge which comes and goes all the time- tested many times for bv and yeast- always negative- just 1 partner.

Get tested : Yeast infections & bacterial vaginosis are nonsexually transmitted vaginal infections which are common in pregnancy. If you are having vaginal discharge you should should be tested for gonorrhea, chlamydia & trichomoniasis. Some women will have excess vaginal discharge without having an infection from the hormonal changes. Many also leak small amounts of urine.

Yeast &or infection : Could still probably be either be BV and or yeast. I would probably try again to aggressively treat for both possibly using different meds, maybe even oral meds this time if vaginal meds used before.