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

Patient's question:

I have always had a regular menstrual cycle, but this month my period is delayed by 8 days and has not arrived yet. I feel a bit of breast tenderness and overall fatigue, always feeling like I want to sleep. I used a pregnancy test and the result showed two lines, one dark and one light. The doctor said it's pregnancy, but it's due to a short gestational age and low hormone levels.
What kind of help do I need: What does it mean when the pregnancy test shows one dark and one light line?

Doctor's answer:

Problem Analysis: Hello, in general cases where menstruation is delayed, a pregnancy test will first show a clear red bar. If another clear bar appears within 5 minutes, it can confirm pregnancy. The possibility of pregnancy is relatively high when there are two bars, one dark and one light.

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