The mucus plug is a thick, gel-like substance that forms in the cervix during pregnancy. It acts as a protective barrier, sealing the uterus and helping to prevent bacteria and other harmful substances from entering. The mucus plug is typically composed of cervical mucus and can vary in color and consistency. As pregnancy progresses, the mucus plug may be expelled from the body, often signaling that labor is approaching. This can happen days or even weeks before delivery. While losing the mucus plug is a normal part of the process, it is important for pregnant individuals to monitor any changes and consult their healthcare provider if they have concerns.