After completing sexual intercourse, the sperm can combine with the egg in about 24 hours to produce a fertilized egg. After ovulation, the egg cell stays in the body for about 24 hours, and having sex at this time can maximize the chances of conception. When the sperm enters the woman’s body, it needs to pass through the cervix and uterus and then reaches the fallopian tube and completes the combination with the egg, and the process usually occurs within 24 hours of sex, and after the fertilized egg is formed, it needs 6-7 days to complete the implantation. After having unprotected sex, if there are symptoms such as delayed menstruation and breast tenderness, it may indicate pregnancy. It is recommended that you go to the hospital half a month after the intercourse to check the blood hCG level to determine if you are pregnant and whether the pregnancy is in a normal state.