Gammaglobulin in early pregnancy can play a role in preventing infection in pregnant women, preserving the fetus and preventing fetal infection. 1. Preventing infections in pregnant women: human immunoglobulin is a blood protein preparation containing a variety of antibodies with antibacterial effects, so it has the ability to enhance the body’s resistance and prevent infections. 2. Foetus preservation: For pregnant women with poor physical condition or habitual miscarriage, in the early stage of pregnancy, if the embryonic tissue is not stable, in order to avoid the occurrence of miscarriage again, human immunoglobulin can be injected in advance to prevent pathogen infection, to a certain extent, it is a foetus preservation effect, and it can reduce the chances of miscarriage. 3. Prevent fetal infection: if the pregnant woman herself suffers from hepatitis B, can be injected with human immunoglobulin under the guidance of the doctor, can enhance the physical condition of the pregnant woman, can prevent fetal infection with hepatitis B. The patient’s body can be treated with human immunoglobulin. Adverse reactions such as transient headache, panic and nausea may occur during the medication. The use of the drug is prohibited for people who are allergic to human immunoglobulin or have a history of other severe allergies. It is recommended that pregnant women should be under the guidance of a doctor in early pregnancy to clarify whether they need to take gammaglobulin or not, and avoid unauthorized use of the drug to avoid adverse effects.