The most natural method of contraception, given to us by nature, is associated with the menstrual cycle. If a woman knows your menstrual cycle, it could protect themselves from unwanted pregnancy and, on the other hand, choose to conceive these days of the month during which pregnancy is most likely to occur.
Woman's menstrual cycle as the basis for safer sex
Menstrual cycle consists of several phases. In each of these phases in the woman's body is different, and sometimes opposite effects via the hormone system. Total of three phases, and they divide the menstrual cycle into three unequal time periods.
The first phase - a first half of the menstrual cycle. Menstrual cycle begins on the first day of menstruation. At this time in a woman's ovaries occurs oocyte maturation, which is placed in the follicle (the bubble). Depending on what the duration of the entire menstrual cycle (it can last 21 to 30 days or more), the first phase may last from 10 to 15-16 days or more. At this time, a woman's body are the female sex hormones estrogen and follicle-stimulating hormone (FSH), the pituitary gland - the main endocrine glands of man. These hormones stimulate the maturation of follicles in the ovary and prepare the mucous membrane of the uterus for pregnancy: it expands and becomes loose - in this mucous membrane will be easier to penetrate the fertilized egg.
The second phase - ovulation or the release of an egg from the ovary. This phase is very short - just release an egg from the follicle ruptured into the peritoneal cavity and fallopian tube (this is where she should meet with the sperm). Ovulate mid-menstrual cycle is usually 14-16-th day (need to be considered from the first day of menstruation). At the time of ovulation in the woman's body have the greatest impact pituitary hormones FSH and LH (luteinizing (LH).
Third phase - the second half of the menstrual cycle. During this period, on the site of the bursting of the follicle in the ovary, a new temporary endocrine gland - the corpus luteum, which produces the female sex hormone progesterone
Progesterone - norm and pathology
. Corpus luteum phase begins with ovulation and continues until the bottoms of the menstrual cycle. Progesterone prepares the mucous membrane of the uterus for the introduction of a fertilized egg and trying to delay the ripening of other follicles (they can destroy the pregnancy). If pregnancy does not occur, the corpus luteum atrophies and becomes a scar, as well as progesterone cease to have effect on the body, the mucous membrane of the uterus is rejected, accompanied by bleeding, that is, menstruation begins. Simultaneously it starts a new start of the menstrual cycle.
How to use a menstrual cycle in order to prevent unwanted pregnancies
In order to prevent unwanted pregnancy, you must first carry out the correct calculation of their menstrual cycle. It takes six months to a year. But this method is not suitable for all women, but only those who have a relatively stable menstrual cycle and small deviations in time. During the period of calculation of the menstrual cycle can not use hormonal contraceptives.
To perform the calculations necessary to make a special notebook, where you can mark the start and end of the menstrual cycle during the analyzed period. Once these records appear for at least six months, it is possible to calculate. To do this, take two periods, the shortest and the longest during the analyzed time. From a short period of consuming the number 18 (the day of the turns dangerous period), from the long - 11 (the last day turns dangerous period).
Example: 24 - 18 = 6 (the sixth day - the beginning of a dangerous period); 28 - 11 = 17 (the seventeenth day - the end of a dangerous period). That is, the possibility of pregnancy the woman is from 6 to 17 day menstrual cycle
The days of the menstrual cycle: Four phases
Periods of relative and absolute sterility in the woman's menstrual cycle
If a woman's menstrual cycle is constantly changing, it is a natural contraception method it will be difficult to use. In this case, at least she should know in what period of her body less willing to conceive. There are two periods, one of which is called a period of relative sterility (ie conception is still possible), and the other - Absolutely (absolutely impossible to conceive).
A period of relative sterility called the first period of the menstrual cycle when the egg is not yet ripe. Why is he a relative, if the egg is not? The fact is that unlike the egg sperm in a woman's body much longer (up to 6 days) and should be able to wait for ovulation
Ovulation - How to determine as accurately as possible?
That is, the appearance of the egg in the fallopian tube. Therefore, the closer to the middle of the menstrual cycle, the more dangerous it becomes sex.
The period of absolute sterility comes two days after ovulation (egg daily lives, and another day - an amendment to an error in the calculations). After that conception is absolutely impossible, because there is no egg, and she will be a very long time (at the sperm have no chance to wait for it).
The menstrual cycle of women - a delicate instrument, which at the correct calculations can be used for safe sex
Safe Sex - Myth or Reality?