The stages that an embryo undergoes when an egg and sperm are fertilized
The embryo, which is formed by the union of sperm and egg cells, progresses towards the uterus by increasing the number of cells in the first and second weeks of pregnancy. The embryo, which has arrived in the uterus at the end of the 3rd week and the beginning of the 4th week of your pregnancy, will attach to the inner wall here. This attachment process occurs when the inner wall of the uterus gains a sticky and soft structure with a dissolving substance. Thus, the embryo will be embedded here by choosing the most suitable area for development within the wall. After this embedding, the embryo will be surrounded by a layer, thus protecting your baby from all kinds of external effects. After the implantation is complete, your baby will start to secrete the beta CGH hormone by showing its first physiological sign other than cell division. Thanks to this hormone, the mother's entire body is given the message that the embryo has started to implant in the inner wall of the uterus.
After this message is given, all cells in the embryo are now ready to differentiate and form embryonic layers by sharing their duties. The formation of embryonic layers initially occurs when the cells that will form your baby's body cells and the cells that will feed these cells separate from each other and the amniotic cavity is formed. The cells called trophoblasts are the cells that will provide nutrition. These cells immediately connect to the capillaries in the inner wall of the uterus and begin to provide nutrition for your baby's body cells. In later stages, the placenta, which protects your baby in every sense and is responsible for its nutrition, will form in the trophoblast cells. The cells that will form your baby's body cells and therefore its organs are called embryoblasts. These cells first form the structure called the yolk sac. Then, the embryonic layers mentioned will be formed by arranging these cells in disc-shaped rows, and these embryonic layers will form your baby's organs, the skin structure covering the body, and the internal body cavities. In other words, it is thought that the sheath that can carry your baby's organs is being formed first. Later, organs, which are also composed of differentiating cells, will settle into their appropriate places within this sheath and begin to carry out their physiological activities. Of course, the formation and functioning of each organ of your baby does not occur at once, and the formation of each structure in the body develops and changes over the weeks, taking place in a certain order and sequence.
At this time, the first sign of pregnancy, the mother's period, is delayed. At this stage, some tests can be used to determine whether you are pregnant or not.
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