Menstruation has no effect on the cervical cancer vaccine. The cervical cancer vaccine is given in three doses, the first dose, the second dose one month or two months later, and the third dose six months later. If you are menstruating during this period, it will not affect the cervical cancer vaccine. If it is determined that you are pregnant, you need to suspend the cervical cancer vaccination. However, the previous cervical cancer vaccination will not affect the pregnancy and the pregnancy can still continue as long as the HPV vaccination is stopped. However, it is not recommended to take the HPV vaccine if you notice any discomfort, fever or other illnesses, as well as if the injection site is infected or red and swollen. In addition, routine cervical cancer screening should be done before the HPV vaccine is given to rule out cervical disease before the HPV vaccine is given.