The embryo, which started to attach to the uterus at the end of the last week (the 6th day after fertilization), will have completed its settlement in the uterus by the end of the 4th week.
The embryo will grow and develop itself during settlement this week, just as it did during its journey in the tube last week. It will change.
The change this week is more complex. The cell mass, which is roughly shaped in the 3rd week, differentiates in this week. The outer cell mass, which will provide nutrition to the baby, interacts with the mother's capillaries and initiates the first nutritional exchange between the mother and the baby. The inner cell mass that will form the baby forms the nutritional sac called yolk sac, three separate layers (endoderm, mesoderm, ectoderm) that will ensure the development of organs, and this structure (embryonic disc) can be defined as the first state of the baby.
Embryo, uterus. After swimming freely in the internal cavity for about 2 days, it prefers the upper parts of the posterior wall of the uterus, where blood supply is very good, for settling. Placement occurs through the melting and scraping effect of specialized cells in the outer layer on the inner layer of the uterus. The embryo is buried inside the melting area and is covered with cells in the intrauterine layer. Settlement is completed on the 12th day after fertilization. The embryo obtains the nutrients it needs during the settlement phase from the blood and secretions that fill the spaces formed by specialized cells with dissolving and scraping properties. Sometimes some blood leaks from these spaces into the inner cavity of the uterus. This bleeding, called “implantation bleeding”, can be confused with menstrual bleeding because it may coincide with the next menstrual period. Nutrition then continues with the nutritional sac, which we call the yolk sac. This sac transfers its function to the placenta after the 6-8th week.
From the 2nd day of implantation (average 8th day after fertilization), the cells in the outer part of the cell mass begin to secrete beta-hCG hormone. This hormone, which is the first medical evidence of pregnancy, ensures the continuation of pregnancy and the stopping of menstruation and ovulation.
At the end of this week, you may be expecting menstrual bleeding. When your period is late, you can understand whether you are pregnant or not by testing the pregnancy hormone in your blood or using a urine dipstick test. If your periods are regular and occur every 28 days on average, your period will come without delay. You can diagnose pregnancy by checking the pregnancy hormone this week. For the urine test, waiting for the delay in menstruation will give more accurate results.
A significant portion of pregnancies are eliminated by your body without being noticed, that is, before the menstrual delay occurs. Eliminations (miscarriages) are generally caused by the fact that the chromosomal numbers and structures of these embryos are not formed healthy during the fertilization phase. If pregnancy is detected by measuring the pregnancy hormone level in the blood before menstruation is delayed, these pregnancies that result in miscarriage (chemical pregnancies) can be recognized. Therefore, if you say you have never been pregnant, you may have been pregnant; if you say you have had pregnancies but have never had a miscarriage, you may have had a miscarriage.
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