What are the reasons for one deep and one shallow line on an early pregnancy test?

Patient's question:

I usually have a regular menstrual cycle, but this month my period has been more than a few days late. I only feel a bit of breast tenderness, fatigue, and often feel like sleeping. I took a pregnancy test, and the results showed one dark and one light line. The doctor said it's pregnancy, but it's just an early pregnancy.
What kind of help do I need: What could be the reason for one dark and one light line on the early pregnancy test?

Doctor's answer:

At the beginning, the two lines measured were one dark and one light. When the urine concentration was high, the second line measured was clearer. If only one line appeared on the test strip, it was likely due to drinking water, which diluted the urine, making the second line less visible. Using morning urine for testing is more accurate. If your menstrual cycle is regular, you have had normal sexual activity, and you have not taken any effective contraceptive measures, and your menstrual period is delayed, and the early pregnancy test result is weakly positive, the possibility of pregnancy is relatively high.

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