When you lose your mucus plug, it means that your cervix is softening, thinning, and opening up as your body prepares for labor. The mucus plug is a thick piece of mucus that blocks the opening of your cervix during pregnancy, and it forms a seal to prevent bacteria from entering the uterus. The mucus plug is usually clear, off-white, or slightly bloody in color, and its look, size, and texture can vary. Losing the mucus plug can happen days or weeks before labor starts, or it can happen during labor. Although losing the mucus plug can be a sign of labor, it doesnt always mean that labor is imminent. In some cases, labor may not start for several hours, days, or weeks after losing the mucus plug. If you lose your mucus plug before 37 weeks of pregnancy, it's best to contact your healthcare provider as a precaution, as this could be a sign of preterm labor or other pregnancy complications.