There is no great difference in the vitality of sperm throughout the day, and usually, you can get pregnant if you have intercourse during a woman’s ovulation period. After intercourse, normal sperm can survive in a woman’s body for 72 hours, so the easiest time to get pregnant is the day before or on the day of ovulation, when the chances of sperm and egg union are highest. However, there is no clinical data to show which time of the day is the easiest time to get pregnant, as long as it is within the ovulation period. Ovulation usually occurs about 14 days before a woman’s next menstrual period. If a woman has a menstrual cycle of 28-30 days, ovulation occurs in the middle of 2 periods. Ovulation can be predicted by monitoring the basal body temperature, which will increase by 0.3-0.5°C after ovulation. In addition, before pregnancy, both men and women should do pre-conception check-ups to exclude infectious diseases, genetic diseases and viral infections, etc. By abstaining from smoking and alcohol for three months in advance and taking folic acid on time for the female partner, a healthy baby can be conceived.