The sperm survival time after intercourse is 2-3 days. Men ejaculate around 300 million sperm per ejaculation. Quality sperm will travel towards the fallopian tubes to unite with quality egg cells, and most of the sperm will flow out from the vagina. When preparing for pregnancy, you can choose to have intercourse during female ovulation, which will not only improve the chances of pregnancy, but also improve the quality of egg cells as women are more likely to discharge quality egg cells during ovulation. During the preparation period, both spouses should relax and not be overly stressed, and they can exercise properly to improve their physical fitness. Since the formation of fertilized eggs is complicated, women should pay more attention to rest after intercourse, avoid staying up late, eliminate bad habits and develop good living habits to promote better formation of fertilized eggs.