Typically, it takes about 24 hours for the sperm to unite with the egg cell, but it varies from person to person. Sperm-egg union is primarily the time between the initial meeting of the sperm and the egg cell and the formation of the actual fertilized egg. The process of forming a fertilized egg is mainly the process of combining the sperm and the egg cell. The egg cell is most viable 6 to 24 hours after ovulation, while the average sperm survival time in a woman’s body is 24 to 72 hours. The site of fertilization is in the juxtaposition of the fallopian tube. After the sperm is energized, it combines with the egg cell in the juxtaposition of the fallopian tube, and then undergoes a series of physiological changes to form a fertilized egg. It usually takes about 24 hours for the sperm to enter the woman’s body, for the two to meet and for the fertilized egg to form. The process of pregnancy is relatively complex and requires good quality sperm, mature egg cells, proper endometrial thickness and stable estrogen and progesterone. During the preparation period, you should relax and have intercourse every other day during the ovulation period and increase the frequency of intercourse to increase the chances of pregnancy. To summarize, if you need to prepare for pregnancy, you should consult a professional doctor.