There is no such thing as the fastest clinical sign of conception. After conception, there may be symptoms such as menopause, elevated human chorionic gonadotropin and early pregnancy reaction. 1. Menopause: After successful conception and implantation, the fertilized egg develops in the uterus and the embryo is in the stage of growth and development, and the levels of estrogen and progesterone in the pregnant woman’s body increase significantly, and the first symptom that appears is menopause. 2. Elevated human chorionic gonadotropin: after successful fertilization, the human chorionic gonadotropin in the pregnant woman’s body will be obviously elevated, which can be determined by blood or urine test. 3. Early pregnancy reaction: after successful conception and implantation, some people may not have any obvious feeling, while some people may have early pregnancy reaction such as vomiting, nausea, fatigue and drowsiness. During the preparation for pregnancy, take folic acid on time, pay attention to rest, go to the hospital for examination in time, and if you are sure that you are pregnant, you need to follow the doctor’s advice to take a maternity test on time.