The absence of visible yolk sac and embryonic tissue on ultrasound may be normal, but it does not exclude the presence of embryonic dysplasia, which can be dealt with by regular pregnancy tests, fertility preservation, and termination of pregnancy.
Under normal circumstances, the yolk sac can be seen at about 5 weeks of pregnancy. However, if the woman’s menstrual period is irregular, it will cause ovulation to be delayed, resulting in the yolk sac appearing at a time that does not correspond to the number of days of pregnancy, which is mostly normal. In this case, the yolk sac and embryo buds can be seen when the ultrasound is repeated after 7 to 10 days.
If the quality of the egg and sperm is poor, or the fertilized egg is stimulated by bacteria or other adverse factors, resulting in poor embryonic development, the yolk sac and embryonic bud tissue may not be visible on the ultrasound.
At this time, if the embryo development is delayed, no chromosomal abnormalities, etc., can follow the doctor’s instructions to use progesterone and other drugs to preserve the fetus; if the embryo stops developing, the pregnancy should be terminated in a timely manner.
If the pregnant woman does not see obvious yolk sac and embryonic tissue in the ultrasound, it is recommended to consult a doctor in time, under the guidance of the doctor, improve the relevant examination, clarify the cause of the disease, and treat the cause of the disease.