The first signs of pregnancy - a time frame: How does the nervous system?
first signs of pregnancy appear in their timeline.We can not say that all women are certain signs of pregnancy appear at the same time, but in general their appearance corresponds to certain terms.If you know in advance the first signs of pregnancy first signs of pregnancy to delay: Eyes on intuition? , the doubt whether the pregnancy occurred, will not.
What happens in a woman's body immediately after fertilization
Immediately after the egg is fertilized in a woman under the influence of the central nervous and endocrine systems, there are numerous complex changes that contribute to the maintenance of pregnancy and normal development of the fetus.
first pregnancy responds central nervous system (CNS).In order to reduce the excitability of the receptors of the uterus and prevent it from muscle contraction, which is able to cause the expulsion of the fertilized egg from the uterus, it decreases the excitability of the total, which causes a pregnant woman drowsiness and fatigue.Under the influence of the nervous system in women varies work of the senses, such as taste and smell.
drastic changes occur in the endocrine system.The main hormone of the first month of pregnancy, progesterone is Progesterone - norm and pathology , which is released by the corpus luteum of the ovary (temporary endocrine gland formed in situ ruptured follicle from which came out mature egg).To stimulate its production starting another pregnancy hormone - human chorionic gonadotropin (hCG), which begins to produce shell embedded in the uterine wall of the embryo in the second week of pregnancy.During the first months of pregnancy the amount of HCG is constantly growing, resulting in a yellow body grows and begins to intensively produce the female sex hormones estrogen and progesterone.
In what terms appear certain signs of pregnancy
very first reaction to the pregnancy - the central nervous system canappear already in the first week of pregnancy.This drowsiness and dizziness.The woman is not getting enough sleep, which is often the cause of irritable weakness afternoon.Women are annoying, you just want to relax and see no one.
Hormonal system comes into operation in the second week of pregnancy after embryo get to the uterus and its shell begins to produce hCG.Drastic hormonal changes bring even greater irritability Irritability - Try to control your mood and constantly changing moods.
the beginning of the second week may already be signs of pregnancy associated with the operation of the autonomic nervous system (ANS), which innervate the internal organs and blood vessel walls.Under the influence of a sharp hormonal shift work VNS broken, causing the spasms, the dilation of blood vessels.Blood pressure due to this can then fall, then rise slightly.This leads to bouts of nausea, dizziness when suddenly there Dizziness - if the ground is slipping from under his feet , nausea, blurred vision and a woman may even lose consciousness.
Changes in the senses can also begin in the second week of pregnancy.First taste changes - in the mouth appears smack of metal.This sign yet know our grandmothers.Then I taste preferences: what used to eat a woman happy now disgusts and vice versa, dishes, had not attracted her become your favorite.
By the end of the second week of pregnancy, a woman begins to notice that it prevented some smells.Scents can literally chase a woman, causing her fear of public places.
All these subjective symptoms of pregnancy are not all pregnant women, some just do not notice their condition.
But it's hard not to notice, for example, changes in the mammary glands.They just happen to all women and there by the end of the second week of pregnancy when the hormonal system will work.Breasts increase in size, the nipples and the surrounding areola darken.At the same time, you may receive pigmentation (brown spots) on the forehead and the area of the median line of the abdomen.
What objective studies can confirm the first signs of pregnancy
pregnancy test can be positive at the end of the second week, but only if it is a highly sensitive test.The sensitivity of the pregnancy test is stated on the package, the lower its number, the more sensitive is the test.At the same time it is possible to donate blood for the quantitative determination of human chorionic gonadotropin.
Starting with the fifth week of pregnancy can be verified during an inspection of an obstetrician-gynecologist and ultrasound.