At 7 weeks or 49 days of pregnancy, the fetal heart and germ are already present and the development of the baby can be determined through ultrasound examination. At 7 weeks of pregnancy, the gestational sac is about 35mm and if the embryo is developing normally, a fetal heartbeat and fetal bud will be detected through ultrasound testing. If there is no heartbeat or germ, it is recommended to check again after 1 week. If it is still undetectable, it may indicate that the fetus is underdeveloped and it is recommended to perform further tests such as HCG and if necessary, abortion should be performed in time. The fetal development is unstable at 7 weeks of pregnancy, so pregnant women must go to the obstetrics and gynecology department of the hospital for regular check-ups to observe whether the size of the embryo and the gestational sac are in line with the days of menopause, and if any abnormality is found, they need to seek medical treatment in time. At 7 weeks of pregnancy, pregnant women can take folic acid supplements as prescribed by the doctor to prevent vascular malformation in newborns. Also pay attention to rest, strengthen diet and nutrition, avoid exposure to things with radiation, do not exercise strenuously and forbid intercourse to avoid risks such as miscarriage.