On what day after menstruation it is possible to become pregnant and how conception without ovulation occurs
Disputes about whether you can get pregnant after menstruation, continue for more than a decade. According to the calendar method of contraception, this time is considered safe. But regular cases of unwanted conception after the end of critical days prove the opposite. To understand why the proven method of protection can not work if you understand the nuances of the processes of ovulation and fertilization.
The growth of follicles in the ovaries is a cyclic process. Reproductive system every 21-30 days constantly repeats the actions directed on an opportunity of fertilization of an ootid. There are four phases of the cycle:
- Follicular. The hypothalamus stimulates the production of the gonadotropin hormone to activate another part of the brain – the pituitary gland. This area produces substances for the regulation of internal organs. The pituitary gland begins to produce follicle stimulating hormone (FSH), which, with blood flow, gets to the ovaries. The simultaneous active maturation of a couple dozen eggs begins.
- Ovulatory. The fastest growing egg breaks the follicle and enters the fallopian tubes in anticipation of spermatozoa. A fertile window begins when a woman can conceive a child.
- Luteal. The follicle broken by the ovum temporarily turns into a yellow body – the gland that secretes progesterone and estrogens. Under the influence of these hormones, the uterus builds up the endometrium, preparing for a possible pregnancy. Simultaneously, the pituitary gland ceases to produce FSH and the rest of the ovum does not ripen.
- Menstrual phase or pregnancy. If fertilization occurs, the egg enters the uterus and attaches to the endometrium, and the yellow body continues to work for another 9 months. Otherwise, progesterone production ceases. Excess uterine endometrium is destroyed by the action of prostaglandins, standing out with blood from the genital tract.