If you are pregnant after the second injection of the nine-valent vaccine and the ultrasound suggests that the embryo is well developed, you can continue the pregnancy and need to suspend the continuation of the vaccination and take obstetric examinations on time. The vaccination is an effective preventive measure against cervical cancer, and the whole process of vaccination requires three injections and lasts for six months. As the effect of the vaccine on pregnancy and breastfeeding is not clear, vaccination is not recommended during pregnancy preparation and breastfeeding. However, when an unplanned pregnancy occurs during the vaccination period and the ultrasound examination indicates that the embryo is well developed, the pregnancy can be continued and strict prenatal checkups should be carried out. When an unplanned pregnancy occurs during vaccination with the nine-valent vaccine, it is necessary to suspend the continuation of vaccination, but continue to carry out strict prenatal checkups, such as NT (fetal nuchal translucency thickness) measurement, Down’s syndrome screening or non-invasive prenatal checkups, and screening for structural ultrasound anomalies of the fetus, and so on. Vaccination can be continued after the end of pregnancy or after the end of breastfeeding, depending on the advice of a medical professional.