Unfertilized eggs are eggs that do not meet and unite with sperm, or it could be that the egg and sperm meet and for some reason do not unite to form a fertilized egg, etc. The sperm survives in the woman’s body for 2-3 days after ejaculation and the egg survives in the body for 1-2 days after discharge. If the timing of intercourse is not right, the sperm will die after ejaculation before ovulation and the sperm and egg cannot meet. If you do not have intercourse after ovulation, the egg will die without encountering the sperm resulting in the inability to fertilize. If you are planning to get pregnant, it is best to have intercourse during a woman’s ovulation period to increase the chances of conception. It is best to use ultrasound or ovulation test strips to monitor the development of follicles during ovulation, and the chances of pregnancy can be as high as 90% if you have timely intercourse after finding mature follicles. You can go to the hospital to have a blood test for HCG about 10 days after intercourse to determine if you are pregnant.