How do you know if you have an incompetent cervix?

Painless early deliv: Painless midtrimester delivery is a typical definition of incompetent cervix. More modern definitions rely increasingly on sonographic features before preterm birth, such as a very short cervical length (<15 mm by transvaginal sonography) in asymptomatic women. If you are diagnosed with incompetent cervix, vaginal Progesterone and possibly cervical cerclage could help you carry a pregnancy 2 term.