Pregnancy is not necessarily related to the number of sexual intercourse. If there is a demand for pregnancy, and the prerequisite is that the male partner’s sperm is viable and the female partner is ovulating, the probability of conception is relatively higher and pregnancy may occur after one sexual intercourse. Usually, sex twice a week can increase the chances of conception if both partners are healthy. However, pregnancy is mainly related to the following factors: 1. The male testicles can produce sufficient number of sperm with normal shape and vitality, and the vas deferens is open. If the male sperm count is less than 20 million per milliliter, conception will be difficult; 2. The female ovaries can produce normal mature eggs and the fallopian tubes are open. If a woman is unable to ovulate or if the eggs she expels are unhealthy, conception is also easily affected. This may be due to ovarian causes, hypothalamic-pituitary function, or mental factors, external environment, etc. 3, the couple should have normal sexual intercourse within a certain period of time before and after ovulation, and ensure that the sperm enter the female reproductive tract and fertilize the egg. In summary, pregnancy is related to the physical conditions of both men and women, and is not necessarily related to the number of sexual intercourse. However, if the physical condition is normal, increasing the number of intercourse can increase the chance of conception.