Definition - What does Mucus Plug mean?
A mucus plug is a collection of cells and other biological factors produced by the cervix, that fill the cervical opening, protecting and sealing the uterine entrance during pregnancy.
FertilitySmarts explains Mucus Plug
The formation of the mucus plug is sometimes associated with a noticeable increase in vaginal discharge called leukorrhea and can be an early sign of pregnancy. The mucus plug passes out of the cervix into the vagina and out during labor. It can also pass before labor, and its passing is not an indication that labor is definitely going to happen immediately. Once the mucus plug passes, however, the uterus does not maintain the same level of protection against infection as it had while the plug was in place.