David's early pregnancy test is typically referred to as an early pregnancy detection strip, while HCG usually stands for human chorionic gonadotropin. The comparison between the color of the early pregnancy detection strip and the value of human chorionic gonadotropin mainly includes three results: weak positive, positive, and strong positive.

1. Weak Positive

The early pregnancy detection strip and the value of human chorionic gonadotropin can help understand whether a woman is pregnant. If after using the early pregnancy detection strip, both the control line and the test line appear red, and if the color of the test line is lighter, the value of human chorionic gonadotropin may be 100U/L.

2. Positive

If the early pregnancy detection strip shows a clear result, it indicates that the woman is pregnant, and the value of human chorionic gonadotropin may be between 200U/L and 300U/L.

3. Strong Positive

If the test line of the early pregnancy detection strip is significantly stronger than the control line and is red in color, it is most likely a strong positive result, and the value of human chorionic gonadotropin may exceed 300U/L.

It should be noted that there may be a certain degree of error with the early pregnancy detection strip, and it is recommended to promptly visit a hospital for related examinations, such as blood routine tests, urine routine tests, and B-ultrasound examinations.