After the bivalent vaccination, when the menstrual period is delayed and it is clear that you are not pregnant, you can observe for a while, and you can continue the pregnancy when you confirm that you are pregnant and the ultrasound suggests that the embryo is well developed. The bivalent vaccine can prevent the occurrence of cervical cancer, the whole vaccination requires a total of three injections, which lasts for six months, and the period refers to menstruation. When menstruation is delayed after the vaccine, you can determine whether you are pregnant through blood HCG (human chorionic gonadotropin) test. When pregnancy is not confirmed, the patient can be observed for a while. When pregnancy is confirmed and the ultrasound indicates that the embryo is well developed, the pregnancy can be continued. Since the effect of the vaccine on pregnancy and breastfeeding is not clear, vaccination is not recommended for women who are preparing for pregnancy, pregnant or breastfeeding. However, when an unplanned pregnancy occurs during the vaccination period and the ultrasound suggests that the embryo is developing well, the pregnancy can be continued, and prenatal checkups should be performed on time and in strict accordance with the doctor’s instructions.