The menstrual cycle and pregnancy are two interrelated processes. It is known that only in normal (regular) menstrual cycle in women it is possible to conceive, carry and give birth to a child. Any menstrual disorder significantly reduce her chances of fertilization, so the functioning of the organism and the presence of chronic diseases and stress depends not only on the overall health of women and the state of her health, and her reproductive function. In addition, the chance of getting pregnant is directly related to the day of the menstrual cycle
The days of the menstrual cycle: Four phases
The follicular phase of the menstrual cycle
Follicular (proliferative phase) is the first phase of the menstrual cycle begins with the first day of menstruation. At this stage of the female body has two objectives: the main follicle maturation and complete clearance from the contents of the uterus (the decidua) from the previous cycle. Action follicular phase takes place under the control of follicle stimulating hormone (FSH), which is synthesized by the pituitary gland. Under the influence of FSH in the ovaries begin to produce estrogens, are responsible for the growth and maturation of follicles.
In each menstrual cycle, a woman at the same time begin to mature around 20 follicles, one of which becomes the main, precisely because it will mature egg. At this stage lining of the uterus begins to recover and grow, there is rapid growth of glands and increased blood flow in the endometrium. The duration of the first phase of the menstrual cycle corresponds to about half the length of the cycle. In the middle of the cycle (about the fourteenth day) ovulation occurs.
After the egg in the dominant follicle has reached a maximum maturity, the hypothalamus sends signals to the pituitary gland, which reduces the production of follicle stimulating hormone secretion and starts luteinizing hormone (LH). Under the influence of the LH main burst follicle and mature egg is released into the abdominal cavity. This process is called ovulation
Ovulation - How to determine as accurately as possible?
. Without ovulation, fertilization is impossible, and thus pregnancy. As noted above, ovulation occurs in the middle of the menstrual cycle. After the egg fell into the abdominal cavity, it tends to penetrate into the lumen of the fallopian tube to meet sperm. For successful conception
Conception, ovarian cycle, fertilization and genetics of a child
and subsequent pregnancy should take into account the period of viability egg (about 24 hours). The moment of ovulation and the next day after it considered the most favorable days for the possibility of getting pregnant.
Luteal phase of the menstrual cycle
Luteal (secretory phase) of the menstrual cycle is the second phase and proceeds under the control of LH. Under the influence of luteinizing hormone on the spot ruptured follicle forms the corpus luteum of menstruation, which begins to synthesize progesterone
Progesterone - norm and pathology
. Progesterone provides a friability of endometrial and fills it with liquid and nutrients. These processes are aimed at the preparation of the functional layer of the mucous membrane to the adoption of a fertilized egg (implantation). In addition, progesterone reduces the contractile activity of the muscle layer of the uterus, ie it prevents expulsion of the fertilized egg from its cavity. After implantation (attachment of a fertilized egg to the uterus), corpus luteum grows and becomes the corpus luteum of pregnancy. Its mission is to further the synthesis of progesterone and the continuation of the pregnancy.
If fertilization has occurred
If fertilization has occurred, the corpus luteum regresses and menstruation disappears. The level of progesterone in the body decreases dramatically in the lining of the uterus occur circulatory disorders (blood does not flow in the blood vessels of the endometrium, it subsides, and starts bleeding or menstruation). The composition discharge during menstruation the functional layer includes particles of endometrium and blood. Since the beginning of the menstrual bleeding begins a new menstrual cycle.
- menstruation and pregnancy