In normal early pregnancy, the fetal bud and fetal heart do not develop at the same time. The fetal bud develops earlier while the fetal heart develops later. Normally, the fetal bud structure can be developed 40-50 days after gestation. At this time, the gynecologic ultrasound can reveal the fetal bud structure. If the gynecologic ultrasound does not reveal the germ structure after 50 days of pregnancy, it may indicate that the embryo has stopped developing. The fetal heart can be developed at 50-60 days of gestation. At this time, a primitive fetal heartbeat can be seen on gynecologic ultrasound. If the fetal heart is not seen beyond 60 days of gestation, the possibility of embryonic arrest is considered. Therefore, it is normal to see no fetal heartbeat on day 48 of gestation. However, the development of fetal bud can be seen in general. If no fetal heartbeat is seen, it is recommended to see the local hospital again in one week for a repeat gynecological ultrasound to clarify the development of the embryo. If the gynecological ultrasound does not reveal the fetal buds and fetal heart structures, then the diagnosis of embryonic arrest can be made. The pregnant woman may consider to give up the pregnancy and be given termination of pregnancy treatment. In conclusion, if no fetal heartbeat or fetal bud is seen at 48 days of pregnancy, the gynecological ultrasound can be repeated after one week and no special treatment can be given for the time being.