A mucus plug forms within the cervix during pregnancy, acting as a protective seal. This thick collection of mucus blocks the opening of the uterus, serving as a barrier against bacteria and potential infections from the outside environment. It forms early in pregnancy, often around week seven, and is composed of cervical mucus, sometimes with traces of blood or tissue. This helps maintain a sterile environment for the developing fetus.
The Varied Experience of Mucus Plug Expulsion
The experience of expelling the mucus plug differs among individuals, with some not noticing its passage. It can be expelled as a single, noticeable glob or gradually in smaller pieces. The appearance can vary, commonly described as clear, off-white, or yellowish. It often has a stringy or jelly-like consistency, typically measuring one to two inches in length and one to two tablespoons in volume.
A common variation involves a slight blood tinge, often called “bloody show.” This can manifest as pink, brown, or red streaks within the mucus. Bloody show occurs when tiny blood vessels in the cervix rupture as it softens and prepares for labor. It frequently accompanies mucus plug expulsion and is considered a normal sign of cervical changes.
What Mucus Plug Expulsion Signifies
Expulsion of the mucus plug indicates the cervix is undergoing changes in preparation for labor. This includes the cervix softening, thinning, and dilating, processes known as cervical ripening. While it signals the body is preparing for birth, losing the mucus plug does not mean labor will start immediately. Labor could still be hours, days, or weeks away for some individuals.
Distinguish the mucus plug from amniotic fluid, or “water breaking.” The mucus plug is thick and jelly-like, whereas amniotic fluid is a gush or steady leak of clear fluid. After expulsion, the body continues to produce cervical mucus, maintaining protection against infection. Unless other signs of labor are present, no immediate action is necessary, and normal activities can continue.
When to Contact Your Healthcare Provider
While losing the mucus plug is normal in late pregnancy, certain signs warrant contacting a healthcare provider. If there is a significant amount of bright red blood, similar to a menstrual period, seek medical advice. This can be different from the typical blood-tinged “bloody show” and might indicate another complication. Contact a provider if the mucus plug appears green or has a foul odor, as this could suggest an infection.
Contact your healthcare provider if the mucus plug is lost before 37 weeks of pregnancy, as this could be a sign of preterm labor. Also, if expulsion is accompanied by strong, regular contractions increasing in intensity and frequency, or a sudden gush of fluid indicating ruptured membranes, contact a healthcare professional.