Pregnancy after the second injection of hepatitis B vaccine usually does not require special treatment, and it is recommended to temporarily stop continuing the third injection of hepatitis B vaccine. Maternal immunity will be reduced during early pregnancy, which may affect the vaccination effect. At the same time, some people may have fever and other adverse reactions after hepatitis B vaccination, which may affect the development of the fetus to some extent. Taking all these considerations into account, it is recommended to temporarily stop continuing the third injection of Hepatitis B vaccine if you are pregnant after the second injection of Hepatitis B vaccine. It is recommended that after giving birth to a child and stopping breastfeeding, then continue to inject hepatitis B vaccine, to obtain resistance against hepatitis B, to prevent the occurrence of hepatitis B virus infection. During pregnancy, you need to be protected, take regular pregnancy tests, and make good adjustments to your diet and lifestyle.