During pregnancy, you can determine whether you have cervical insufficiency through clinical manifestations or ultrasound examination. 1. Clinical manifestations: If there is painless dilatation of the cervix during pregnancy, accompanied by a gestational sac that expands into the vagina, and if there is an old fissure of the cervix and a short cervical-vaginal segment on examination, and if there is a history of mid-pregnancy miscarriage without any cause, cervical insufficiency can be considered. 2. Ultrasonography: Women during pregnancy can also determine their cervical condition through ultrasonography, which mainly examines the length of the cervical opening and the width of the endocervical os, and if dilatation of the endocervical os is detected, the amniotic sac protrudes out of the cervical canal, and the cervix is shortened, cervical insufficiency can be diagnosed. If cervical insufficiency occurs during pregnancy, it is necessary to consult a doctor in a timely manner, complete the relevant examinations under the guidance of the doctor, and carry out targeted treatment and therapy.