A blood flow signal visible inside the germ is a description on the ultrasound during a pregnancy test, and in most cases is indicative of seeing a primitive heart tube pulsation in the fetus, indicating the survival of the gestational sac. At the usual menstrual cycle of 28-30 days, at 6-8 weeks of pregnancy, a visible fetal heartbeat can be seen inside the gestational sac, and a blood flow signal is seen inside the germ on the ultrasound, suggesting normal metabolic activity in that area. Of course, to accurately evaluate the development of the embryo, it is necessary to combine the results of other pregnancy tests to make a comprehensive judgment, and the pregnant woman can perform pregnancy tests regularly. Pay attention to rest, avoid heavy physical labor and strenuous exercise, stay away from toxic and harmful substances, and follow medical advice carefully when taking medications; diet can be supplemented with fresh vegetables and fruits to increase nutrition, avoid spicy and stimulating foods, eat less and more meals, and take appropriate amount of folic acid to prevent fetal neural tube malformation.