Level 1: Causes of abnormal leucorrhea after pregnancy. After pregnancy, due to changes in hormonal levels and body adjustments, the secretions in women\’s bodies will also change accordingly. Under normal circumstances, leucorrhea will increase in early pregnancy, but if the leucorrhea is abnormal, it may be due to the following reasons: 1. Vaginal infection: After pregnancy, a woman’s immunity decreases, and the vagina is more susceptible to bacterial, fungal and other pathogens. 2. Inflammation: Mild congestion, edema and inflammatory reactions usually occur in the neck and vaginal mucosa after pregnancy.