The best time for herbal birth control needs to be analyzed on a case-by-case basis and cannot be generalized. Patients are advised to visit the Department of Traditional Chinese Medicine or the Department of Obstetrics and Gynecology to clarify whether they need herbal birth control and the time of birth control after the doctor’s interview and relevant examinations, and not to use the medicine blindly. In case of ordinary pregnant women, they can choose to undergo fetus preservation treatment through herbal medicine in the early stage of pregnancy, i.e. the first 3 months of pregnancy. The sudden increase of hormone level in women’s body during that period may lead to body maladjustment. Some women have heavy early pregnancy reaction and may experience severe nausea, vomiting and weakness, which can be adjusted by Chinese herbs. As for women with previous pre-term miscarriage or history of miscarriage, they can follow the medical advice to choose the appropriate way to keep the baby, such as herbal medicine can be used to keep the baby during the whole pregnancy. During pregnancy, women need to visit the obstetrics and gynecology department regularly for prenatal checkups to clarify their status and that of the fetus. She also needs to pay attention to a nutritious, balanced and varied diet, and pay attention to rest and not to overwork.