Sometimes for fertilization there is enough one sexual intercourse. At the same time some couples can unsuccessfully try to conceive the child for years. Process of fertilization is influenced by the most various reasons.
Fertilization – difficult physiological process which can happen only during an ovulation. The ripened ovum lives absolutely not for long – only several hours, the spermatozoon is in this regard much more hardy. There were cases when fertilization happened in a week after sexual intercourse. But often married couple cannot wait for conception for a long time, even several years. Then it is necessary to find out why there is no fertilization. All reasons can be divided into three groups: problems of a female reproductive system, problem of a men's reproductive system and immunological incompatibility of partners. Fertilization is impossible if the woman in a menstrual cycle has no ovulation, that is the ovum is not formed, or cannot leave an ovary, for example, because of inflammation of its wall. Violation of periods are often connected with the stress, a hormonal imbalance, insufficient, or, on the contrary, excess weight, a disease. Also the ovum can connect to a spermatozoon, but not get into a uterus cavity owing to impassability of fallopian pipes or violation of their sokratitelny activity. In the latter case extra-uterine pregnancy often develops. It is easier to find problems with a men's reproductive system, but it is heavier to cure. Spermatozoa have to be mobile, hardy, them there has to be enough. If active of them a half less, then the diagnosis infertility is made. And here the reasons of such quality of sperm to establish rather difficult. Besides, fertilisations can not occur owing to violation of an ejaculation of the man. Happens that the married couple is healthy, but it is impossible to conceive the kid at it. It occurs because partners are incompatible on immunological indicators. The organism of the woman does not accept sperm of the specific man, developing against it special antibodies. Spermatozoa perish, without having reached a uterus. The reasons of this phenomenon are unknown.