Patient's question:
Medical Description: Pregnant for over 40 days. During the ultrasound, the gestational sac size was 2617mm, with a yolk sac visible, but the embryonic bud was unclear. Why did the doctor only say the embryo's development was not ideal and recommend a follow-up in one week? At 40 days, should there definitely be an embryonic bud? If there is, how big should it be, and can it definitely be seen on ultrasound? Could it be that the equipment is not advanced enough to detect it? Worried...History of Treatment and Effects: Last year, I had a miscarriage. At 70 days, the ultrasound results showed only an embryonic bud without a heartbeat, and I underwent an induced abortion.
What kind of help do I need: What is a yolk sac? During the ultrasound last year, the ultrasound report did not mention a yolk sac.
Doctor's answer:
The first month of pregnancy is the embryonic period, during which the growth rate of the new life is the fastest in its entire life. At the end of the second week of pregnancy, the sperm and egg combine, and about 4 days after fertilization, the fertilized egg, which has divided into a cluster of cells, travels along the fallopian tube to the uterus. In the third week, the cell cluster sheds its outer membrane, preparing for implantation. By the fourth week, the blastocyst has firmly implanted into the uterus. During this period, the prototypes (the foundational tissues) of the fetal nervous system and circulatory system are almost all formed, and the liver begins to develop noticeably. The prototypes of the eyes and nose have not yet formed, but the prototypes of the mouth and chin can be seen. The umbilical cord, which connects the fetus to the mother, also begins to develop from this period.