Although pregnancy did not officially occur from the first days of conception, these days are the most significant and make a huge contribution to the development of a new life. The child begins to form internal organs, nervous, respiratory, digestive systems. What happens in the first days with the embryo after conception - we will consider it step by step.
• After the zygote has formed, the development of the unborn child begins. From the first day of conception, a fertilized egg begins to make a difficult path to a source of nutrition, where it can fully develop. The ovum makes its way through the fallopian tubes, moving with the help of villi located on the inner surface of the fallopian tubes.
• On the second day, the egg is still moving towards its target, the process is accompanied by continuous cell division at a very intense pace.
• On the third day, the number of cells reaches 9.
• By the fourth day, the fertilized egg takes on the shape of a berry, similar to a blackberry. The egg is still moving towards the uterus. It is from this day that all vital systems, as well as the internal organs of the unborn baby, begin to form through embryogenesis.
• With a continuous process of cell division, cells begin to form inside the fetal membrane - blastomeres. Their enzymes play the role of dissolving the uterine lining, helping the embryo adhere firmly to the uterine wall. On the fifth day, the fetal egg enters the uterus, is fixed there by launching its fibers into the endometrium, merging with tissues and blood vessels. Increases the level of the hCG hormone.
• On the sixth, seventh day, the level of progesterone in the expectant mother rises, the body temperature rises. The child continues its continuous intrauterine development, but still feeding only on its own resources.
• By the eighth, ninth day, the neural tube begins to form in the fetus, the placenta develops, which will be transformed for the next twelve weeks.
Complete reunification of the embryo with the uterus occurs on the fifth day within forty hours. The strongest connection between the body of the mother and the unborn child occurs on the twelfth day, when the baby begins to fully receive placental nutrition.