Most causes of abnormal vaginal discharge — such as yeast infection, bacterial vaginosis or menopause symptoms — are relatively harmless, but they can be uncomfortable. Abnormal vaginal discharge can also be a symptom of certain sexually transmitted infections (STIs). Since these can spread to involve the uterus, ovaries and fallopian tubes A sudden increase in sticky vaginal discharge in pregnancy can be a sign of leaking amniotic fluid, and you should be addressed by a doctor as soon as possible. Let your doctor know about any changes in the color, consistency, or smell of the vaginal discharges as such factors during pregnancy could be a sign of an infection.