A fetal egg is an embryo and an embryonic coat. This period of pregnancy is the first stage of development of pregnancy. And everything begins with the connection of two cells - female and male.
Next, the fertilized egg begins to actively divide, at first into 2 parts, then to 4 and so on. The number of cells, like the size of the embryo, is constantly growing. And the whole group of cells that continue to divide, move along the fallopian tube to the place of their implantation. This group of cells is the fruit egg.
Having reached the goal, the fetal egg is implanted into one of the walls of the uterus. This occurs a week after fertilization. Up to this point the fetal egg feeds on substances that are in the egg itself. And after introduction into the uterus, nutrition is carried out by its swollen mucosa, prepared for the process of feeding and developing the embryo until the formation of the placenta.
The placenta, or a child's place , is formed from the outer layer of the fetal egg, densely covered with villi. These villi in the place of attachment of the fetal egg destroy a small portion of the mucous uterus, as well as the walls of blood vessels, fill it with blood and plunge into a prepared place.
A fetal egg is the very first sign of a normal pregnancy. It can be seen on ultrasound after 2 weeks of menstruation. The embryo becomes visible only on the 5th week of pregnancy. But if at this time the doctor diagnoses the absence of an embryo in a fetal egg-in other words, an empty fetal egg, ultrasound is repeated a couple of weeks later.
Most often in this case, at 6-7 weeks, the embryo and palpitation begin to be visualized. If the fetal egg is still empty, this indicates an undeveloped pregnancy. In addition to this complication, in the early stages of pregnancy, there may be others - an irregular shape of the fetal egg, its wrong location, detachment, etc.
That is why it is important to pass the ultrasound as early as possible in order to be able to change the situation if it is amenable to correction. After all, in the first trimester the risk of spontaneous miscarriage, detachment and other pathologies is great. But enough about the sad.
The fetal egg in the first weeks of pregnancy has the shape of an oval. And ultrasound usually evaluates its inner diameter - the SVD of the fetal egg. Since the diameter of the fetal egg is variable, there is an error in determining the gestation period for this fetometric indicator.
On average, this error is 1.5 weeks. The gestation period, as a rule, is determined not only by this indicator, but also the values of the CTE of the fetus (coccygeal parietal size) and other parameters are used.
Fat egg diameter by weeks
So, the size of the fetal egg by weeks. If the fetal egg has 4 mm in diameter, this indicates a very short period - up to 6 weeks. Most likely, that now the fetal egg corresponds to a period of 4 weeks. At 5 weeks, the SVD is 6 mm, and at 5 weeks and 3 days the fetal egg has a diameter of 7 mm.
At 6 weeks, the fetal egg grows to 11-18 mm, and the average internal diameter of the fetal egg at 16 mm corresponds to a period of 6 weeks and 5 days. At 7 weeks of pregnancy, the SVD ranges from 19 to 26 mm. At 8 weeks the fetal egg grows to 27-34 mm, in 9 weeks - to 35-43 mm. And at the end of 10 weeks the fetal egg has a size of about 50 mm in diameter.
To the question - how fast the fetal egg grows, we can say with certainty: until 15-16 weeks its size increases by 1 mm every day. Further, the size of the fetal egg increases by 2-2.5 mm per day.
The norms of the size of the fetal egg and fetus can also be followed according to the table.