Incompetent cervix is often asymptomatic (which is why it is so important for doctors to consider risk factors), although some women experience mild symptoms. These typically appear between weeks 14 and 20 of pregnancy, and include the following (1, 5): A sensation of pelvic pressure.

What are the chances of having an incompetent cervix?

How common is incompetent cervix? Incompetent cervix occurs in about 1 in 100 pregnancies.

When does cervix start to shorten?

In women at high risk for spontaneous PTB, average CL measurements are 36.7 mm at 15 weeks, 35.7 mm at 20 weeks, and 33.8 mm at 25 weeks. After 28 weeks, however, even women who deliver at term begin to have cervical shortening.