Shedding the mucus plug is just one of the physical changes some women undergo before actual labor starts. As the cervix effaces and also dilates, capillaries usually rupture as well as tints the mucus pink or touches it with blood. The thick mucus has been blocking the open up to the cervix considering that the early part of pregnancy. As the due day approaches, this plug dislodges, breaks up as well as passes out of the expecting female's body.