Three days of successful fertilization is usually without any obvious signs. Successful conception is when sperm and egg meet to form a fertilized egg. Three days of successful conception is usually without any noticeable signs as it is too short a period of time. As conception progresses, menopause and early pregnancy reactions such as nausea and vomiting may occur. To determine if you are pregnant, you can take a pregnancy test or blood test for chorionic gonadotropin one week after menopause. In early pregnancy, as the development of the fetus is still unstable, it is necessary to take sufficient rest, avoid strenuous exercise and physical labor, take proper nutrition, ensure sufficient sleep, and quit smoking and drinking to ensure the normal development of the fetus.