2 days til my due date dilated to 4cm losing alot of mucus plug is that also thinning of the cervix?

Cervix Changes. the cervix dilates from 0 to 10 cm which is ready for delivery. The cervix also thins it starts out about 2-4 cm long and then we judge its thinning by percentages. You will hear 10% effaced(thinned), 50% effaced, completely effaced which means it is thinned all the way. Losing the mucous plug has to do with neither, it is just mucous in the cervix that is lost anytime prior to delivery.