There is a possibility of pregnancy when having intercourse four days before the day of ovulation, for example: 1) the ovulation date is miscalculated and the egg is discharged early to meet the normal sperm; 2) the sperm survives longer than the egg in the woman’s body, usually up to 2-3 days or more, if the sperm survives in the woman’s body for 4 days during intercourse and ovulation happens on the fourth day, there is also a possibility of successful fertilization, resulting in pregnancy. It is also possible to not get pregnant, for example, if the day of ovulation is accurately calculated and the sperm survives for only 2-3 days. If a woman is worried, she can first buy early pregnancy test strips from a regular pharmacy 10 days after intercourse and test with her morning urine. If the result is positive, the possibility of pregnancy is high. It is recommended to go to a regular hospital in time to further confirm the diagnosis and choose the treatment plan as early as possible according to the will.