Normal pregnancy discharge — called leukorrhea — is thin, white or clear, milky in appearance, and mild-smelling or odorless. It is produced by the cervix and vaginal walls in response to the estrogen surge of pregnancy. Think of it as your body's natural housekeeping system: it maintains a healthy vaginal pH, clears old cells, and creates a protective barrier against infection.
Discharge increases throughout pregnancy as estrogen levels continue to rise. By the third trimester, you may notice significantly more discharge than in early pregnancy — this is normal. Some people produce enough to need panty liners for comfort.
The mucus plug — a thick collection of cervical mucus that seals the cervix during pregnancy — may be expelled as pregnancy approaches its end. It often looks like a thick, jelly-like blob that may be clear, slightly pink, or tinged with blood. Losing the mucus plug can happen days or weeks before labor and is a normal sign that the cervix is beginning to change.