The fact that you can’t see the fetal heart on an ultrasound in the 2nd month of pregnancy is an indication that the buds have stopped developing. Before the sixth week of pregnancy is the time for the development of the gestational sac, 6-7 weeks of pregnancy is the time for the development of the embryo bud, and after seven weeks of pregnancy, the fetal heart is formed. From the beginning of germ development, primitive fetal vascular pulsations can be observed, that is, the regular beating of blood vessels can be seen at the yolk sac. In the second month of pregnancy, the size of the gestational sac usually reaches about 3-5 cm in diameter, and the long diameter of the embryonic bud reaches 15-20 mm. the head and body of the fetus can be distinguished, and the pulsation of the fetal heart can be clearly observed at the body of the fetus. If only the buds are seen and the heartbeat is not detected, then the embryo is considered to have stopped developing. If you are really unsure, you can have an ultrasound. Doppler can be used to detect the blood vessel pulsation, or another hospital can be used to review the test again. There are various reasons for embryonic arrest, including the pregnant woman’s own reasons and reasons such as poor germ development. It is recommended that both husband and wife should have a comprehensive pre-pregnancy physical examination to ensure eugenic fertility.