What is the shape of a normal gestational sac?

Everyone knows that after pregnancy, the gestational sac can be used to judge the growth of the fetus. Generally speaking, the gestational sac can be seen more clearly after the fifth to sixth week. The normal shape of the gestational sac is generally oval or round. Some pregnant women may find that their gestational sac is small, or not oval or round when checking it. A small gestational sac is usually caused by the pregnant woman being too nervous or the development being slow. The shape of the gestational sac may be due to different characteristics, which requires examination in the hospital.

The gestational sac is only seen in early pregnancy.

For women who have regular menstruation of 28 to 30 days, after 35 days of amenorrhea, the gestational sac can be seen in the uterine cavity by B-ultrasound. The diameter of the gestational sac is about 2 cm at 6 weeks of pregnancy and about 5 cm at 10 weeks of pregnancy. It is normal for the gestational sac to be located at the fundus, front wall, back wall, upper part, or middle part of the uterus; it is normal for it to be round, oval, and clear in shape; if the gestational sac is irregular in shape, blurred, and located in the lower part, and the pregnant woman also has abdominal pain or vaginal bleeding, she may have a miscarriage.

The gestational sac is the primitive placental tissue, a small embryo wrapped by the amniotic membrane and vascular network.

The gestational sac is the initial form of pregnancy. At that time, the fetus has not yet formed, and the fetal heartbeat is already there when the embryonic bud appears. In the second week, the embryo implants in the endometrium. When it develops into the second germ layer, a large cavity called the primary yolk sac appears on the ventral side of the embryonic disc. The yolk sac continues to shrink and degenerate during embryonic development, but the extraembryonic mesoderm on the wall of the yolk sac is the earliest origin of the formation of blood cells, blood vessels and primitive germ cells - the gestational sac, where the fetus will grow in the future.

The gestational sac is also considered a product of ectopic pregnancy.

If the fertilized egg fails to enter the uterus at 7 days due to inflammation, adhesion or other factors, ectopic pregnancy will usually result in heavy bleeding and the fetus will generally not survive. The baby's mother herself was having an intrauterine pregnancy, but due to poor development of the uterus, the gestational sac broke through the weak top of the uterus and entered the abdominal cavity. The villi around the gestational sac sought nutrients everywhere in the abdominal cavity and then supplied them to the fetus through the placenta. Usually, such a fetus will die within two months because it has no protection from the uterine environment and lives in an extremely harsh environment with poor nutrition.