It is not normal to see a weak fetal heart at eight weeks of pregnancy, which may be caused by poor embryonic development, overworked pregnant women and other reasons. 1. Poor embryonic development: some fetuses may be due to congenital diseases, so the phenomenon of weak fetal heart at eight weeks of embryo. It may also be due to problems with the chromosomes of the embryo’s genes, which leads to a weak fetal heart at eight weeks of pregnancy, and it is recommended to be examined under the guidance of a doctor. 2. The pregnant woman’s own factors: due to the pregnant woman’s poor mood or excessive fatigue and other reasons, resulting in eight weeks gestation fetal heart weak, during pregnancy, it is recommended that the pregnant woman should pay attention to rest, maintain a good mood, strengthen the nutrition, moderate exercise, etc., is conducive to the growth and development of the fetus. If you have a weak fetal heartbeat at eight weeks of pregnancy, it is recommended that you seek medical attention in a timely manner and complete the relevant examinations under the guidance of a doctor to clarify the cause of the disease and treat the symptoms.