Passing a mucus plug is a sign that your cervix is dilating and your body is starting to prepare for birth. Labor could be hours, days, or even weeks away as the cervix gradually opens over time. A mucus plug may be clear, slightly pink or blood tinged in color. It may be stringy mucus or sticky discharge. Some women may not even notice the loss of their mucus plug because there is already an increase in vaginal discharge during pregnancy. posted 09/05/2007 by Domn8rx4.