At what week of pregnancy can the yolk sac be seen?

Pregnancy refers to gestation, and the yolk sac can be seen from the 5th to the 6th week of gestation, which is usually related to the individual's physical condition, so the timing may vary. The yolk sac is derived from embryonic development and is the predecessor of the embryo. It plays an important role in the organogenesis of the embryo, storing and absorbing nutrients, and providing a good environment for the growth and development of the embryo.

If a woman has good follicle quality and the fertilized egg implants early, the yolk sac usually appears earlier, typically around the 5th week of gestation. If the time for fertilization is later, it usually leads to a delayed implantation of the fertilized egg, and the yolk sac will appear relatively later, observable around the 6th week of gestation. Specific conditions require hospital visits for B-ultrasound, blood tests, and other related examinations to better understand the physical condition.

If no yolk sac is detected after the 6th week of gestation, it may be due to embryonic development issues. It is recommended to seek medical attention promptly and terminate the pregnancy under the guidance of a doctor to avoid inducing other symptoms and affecting the woman's health. It is also important to rest, avoid strenuous activities, maintain a healthy diet, and ensure balanced nutrition for physical recovery.