Your mucus plug is a protective collection of mucus in the cervical canal. During pregnancy, the cervix secretes a thick, jelly-like fluid to keep the area moist and protected. This fluid eventually accumulates and seals the cervical canal, creating a thick plug of mucus. The mucus plug acts as a barrier and can keep unwanted bacteria and other sources of infection from traveling into your uterus. Before labor, this mucus plug is expelled allowing the baby to pass through the cervix during labor and birth.

How soon after my mucus plug passes will labor begin?

Passing a mucus plug is a sign that your cervix is dilating and that your body is preparing for birth. Labor could be hours, days, or even weeks away as the cervix gradually opens. Be on the lookout for first signs of labor.

What does a mucus plug look like?

It is usually clear, slightly pink or blood-tinged in color. It can be stringy mucous or sticky discharge. Some women might not notice the loss of their mucus plug since there is already an increase in vaginal discharge during pregnancy. For some women, the mucus plug comes out all at once. For others, it comes out gradually and you may not even know it. You many only see it when wiping after going to the bathroom.

When should I call my health care provider?

If the mucus appears normal in color, there is no urgent need to contact your health care provider. You can give a report on your next visit with the provider.

You should call your health care provider immediately if your discharge suddenly becomes bright red and the amount of discharge exceeds an ounce (about two tablespoons), indicating the possibility of a complication such as a placenta previa or placental abruption.

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Compiled using information from the following source:

Pregnancy, Childbirth and the Newborn: The Complete Guide. Simkin, Penny, P.T., et al, Ch. 9.