Without contraception, the chances of pregnancy are lower when the woman is in her safe period and higher when she is ovulating. The chances of pregnancy are also affected by physical factors of both partners. When a woman has an increased ovulation due to emotional reasons, the chances of pregnancy increase, while if a woman has ovulation disorder, or a man has ejaculation disorder, or semen is not liquefied, the chances of pregnancy decrease. If there is no requirement for childbirth, it is better to take strict contraceptive measures to prevent unwanted pregnancy. In addition, if it is condom contraception, it is better to have the whole contraception, so as to achieve a contraceptive effect. Also if there is no requirement for childbirth, it is recommended to have an intrauterine device to prevent pregnancy. If there are related diseases, it is better to go to the hospital reproductive medicine department for related treatment.