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A mucus plug is a thick clump of mucus that forms a seal at your cervix (the opening to your uterus) during pregnancy. It protects the fetus from bacteria and other pathogens during pregnancy. The mucus plug is a thick clump of mucus that forms in your cervical canal and protects your uterus and your baby from bacteria and other sources of infection. The mucus plug usually falls out in the weeks before you give birth, as your body prepares for labor. A mucus plug is a thick piece of mucus that blocks the opening of your cervix during pregnancy. Learn what it looks like, when you lose it and what it means for labor. The mucus plug is a thick, jelly-like substance, often clear to pinkish-brown, that appears late in pregnancy as labor approaches. Regular discharge is thinner, milky or clear, and occurs throughout pregnancy. While losing the mucus plug can signal upcoming labor, it’s not always immediate.