Vaccines, i.e. drugs that the human body can be immunized with, do not affect conception after vaccination with most of the vaccines approved in China, except for live virus or live bacterial vaccines, common vaccines include influenza vaccine, hepatitis B vaccine, rabies vaccine, etc. The interval required for pregnancy preparation varies from vaccine to vaccine, but since it is not certain that the vaccine is 100% risk-free for fetal development, it is generally recommended that the vaccine be given after 12 weeks of pregnancy if it is not needed immediately. Normal conception can occur about a week after a complete rabies vaccination, and pregnancy can occur one month after a hepatitis B vaccination. There are no special contraindications to the flu vaccine, but if a pregnant woman has other primary illnesses such as asthma or heart disease, flu infection can aggravate complications, so it is recommended to get the flu vaccine before the high flu season. Some vaccines, such as the cervical cancer vaccine and the new crown vaccine, have limited clinical trial data and there is no guarantee whether they will have an effect on pregnancy, so it is recommended to consult a doctor before preparing for pregnancy. For the New Crown vaccine, it is generally considered safer to get pregnant after 3 months of the last vaccination, and after the completion of the last dose of the cervical cancer vaccine, you can first observe 2-3 menstrual periods, and if your period is normal, you can usually get pregnant after 3 months. In addition, the live attenuated vaccine is a nasal spray and is not recommended for pregnant women; the MMR triple vaccine and varicella vaccine are also not recommended during pregnancy. If such women find that they are pregnant after receiving these vaccines, they should pay extra attention to the fact that they can suspend the subsequent doses and go to the hospital for a maternity checkup to explain the details to the doctor and ask if there are any effects before deciding whether to continue the pregnancy.