If the yolk sac has been there for 14 days but there is still no fetal heart, it may be caused by the short duration of pregnancy or abnormal embryonic development. The yolk sac can be detected by ultrasound at about 40 days after menopause, and the fetal heart and buds can be seen at about 7 weeks after menopause. If there is no fetal heartbeat 14 days after seeing the yolk sac, and there is no vaginal bleeding now, you can continue to observe and do a good job of rechecking. It is possible that the pregnancy is short and has not yet developed. However, if after 7 weeks, the review has not seen the fetal heart, this is considered abnormal embryonic development. There is a possibility of empty gestational sacs, and further examination is needed to terminate the pregnancy in time if necessary. There are many reasons for abnormal embryonic development, which may be caused by chromosomal abnormality of the fetus itself, if it occurs many times, it is better to analyze the chromosomes of the embryo. Therefore, when the above situation occurs, you need to consult a professional physician’s opinion, combined with their own situation, pay attention to observation, discomfort, vaginal bleeding, etc. to go to the obstetrics and gynecology department in a timely manner.