some women in early pregnancy is sometimes a little bleeding, which they mistake for the month.But the mechanism of pregnancy is that the monthly during this period can not be, by definition, because if there is a rejection of the mucous membrane of the uterus, how could it hold the fetus?
How pregnancy begins
Provides pregnant woman's menstrual cycle, which takes place in two phases.During the first phase in the ovary matures the egg in the ovary under the influence of pituitary hormones (follicle stimulating hormone) and female sex hormones estrogen.Estrogens also contribute to the widening of the uterus inner mucus layer and education in its glands.
Once the egg is mature, information about that enter the central nervous system and hormonal changes abruptly.Estrogen is greatly reduced, and the pituitary gland begins to stand another hormone - lyuteinieziruyuschy.This leads to the fact that the bubble (follicle), which was the egg, bursts, the egg leaves the ovary and is sent to the fa
moment of release of the egg from the follicle is called ovulation Ovulation - How to determine as accurately as possible? .At the site of the ruptured follicle develops a temporary endocrine gland - the corpus luteum, which starts to produce the female sex hormone progesterone Progesterone - norm and pathology .Under the action of progesterone in the lining of the uterus mature and begin to function glands secreting mucus.The uterus is prepared to accept a fertilized egg.
If fertilization occurred, during the week of the embryo moves through the fallopian tube toward the uterus and at the end of the week it is embedded in the mucosa.First, it is almost completely immersed in the overgrown mucosa and is connected as part of its shell with the wall of the uterus.Gradually, the connection starts to grow blood vessels, which makes it stronger.Over time, this point is formed placenta.A shell of the fruit begins to actively produce the hormone hCG (human chorionic gonadotoropin person), which stimulates the production of progesterone by the corpus luteum.Over time, under the influence of hCG corpus luteum of menstruation grows and becomes a corpus luteum of pregnancy, which produces a lot of progesterone.Progesterone is necessary to slow down the reduction of muscles of the uterus, can cause miscarriage.
If pregnancy does not occur, then this signal is in the central nervous system and changes again hormones: progesterone decreases, it causes a reduction of the uterine muscles, and rejection of the mucous membrane, which is accompanied by bleeding - menstruation.That is, menstruation is due to the rejection of the mucous membrane of the uterus, but if you become pregnant, then this will be attached mucosa germ that would go along with it.This also occurs, and is called spontaneous abortion, that is, the pregnancy is terminated.
Why during pregnancy may experience minor bleeding
menstrual bleeding during pregnancy does not happen.Nevertheless, small bleedings occur and some of them are considered safe.First, a few drops of blood may be released after the introduction of the egg in the lining, because its integrity is violated.But this is minor bleeding, which is quite rare.Then
small bleeding may occur during the first 12 weeks of pregnancy, when the fertilized egg grows and the first time does not occupy the entire cavity of the uterus, which promotes partial delamination decidua (internal mucous layer covering the entire inside of the uterus, including germ withall sides) from the uterine wall, and it is accompanied by a slight bleeding.After 12 weeks of pregnancy, the fetus occupies the entire uterus and such bleeding does not happen.
In addition, the bleeding may not be from the uterus and the vagina or cervix in the development of the inflammatory process, or where the tumor, followed by injuries to during sexual intercourse.
Bleeding during pregnancy - a danger signal
Secure bleeding, of course, occur, but are relatively rare and insignificant.Often they can be confused with the beginning of the serious complications of pregnancy, which are also accompanied by bleeding - it is an ectopic pregnancy Ectopic pregnancy - Fatal dangerous and spontaneous miscarriage.
Ectopic pregnancy can occur in different ways.It can be a sharp sudden pain with dizziness and loss of consciousness - a sign of rupture of the fallopian tube and internal bleeding.And may appear vague pain on one side of the lower abdomen, accompanied by spotting or bleeding from the vagina - a sign of tubal abortion - the embryo of the separation wall of the fallopian tube.Tubal abortion at any time can cause rupture of the pipe.
Spontaneous miscarriage is also accompanied by abdominal pain Abdominal pain: when to sound the alarm? and bleeding.Therefore, any bleeding during pregnancy - is a reason for seeking medical attention.