The probability of natural conception cannot be accurately predicted. Generally speaking, if both men and women are healthy, the probability of conception is lower if they have intercourse during the woman’s safe period; the probability of conception is higher if they have intercourse during the woman’s ovulation period. If a man’s sperm vigor is normal, and the woman’s uterus and fallopian tubes have no abnormalities in ovulation, the probability of conception will be higher if the woman has intercourse during the danger period, that is, the ovulation period; if the woman has intercourse during the safe period, the probability of conception is generally smaller. In addition, the probability of conception is also related to environmental factors, emotional factors, etc. It is also recommended to do a routine physical examination during the preparation period to ensure that both men and women are in good health. It is important to note that if you are preparing for pregnancy, you should maintain a healthy lifestyle and preferably stop smoking and drinking.