Patient's question:
Medical Description: 40 weeks pregnant, during the ultrasound, the gestational sac size was 2617mm, with a yolk sac appearing inside, but the embryo was unclear. Why did the doctor only say the embryo development was not ideal and recommend a follow-up in one week? At 40 weeks, should there definitely be an embryo? If there is, how big should it be? Can it definitely be seen on ultrasound? Could it be that the equipment is not advanced enough to see it? Worried...History of Treatment and Effects: Last year, I had a miscarriage. At 70 days, the ultrasound results showed only an embryo 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. About four days after fertilization, the sperm-egg mass, now a cell cluster, 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 of the fetal nervous system and circulatory system (the foundational tissues) have almost all appeared, 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 already be seen. The umbilical cord, which connects the fetus to the mother, also begins to develop from this period.