What is the reason for one dark and one light line on an early pregnancy test?

Patient's question:

I have an itchy lower body, and my underwear is always yellow. What's going on? Also, why are there two lines on the early pregnancy test, one dark and one light?

Doctor's answer:

Hello, according to the situation you described, the pregnancy test strip showed two lines but they were not very clear, indicating a weak positive result, which suggests pregnancy. It is recommended to wait for 7-10 days before undergoing an ultrasound examination to help diagnose whether it is an intrauterine pregnancy.
There are mainly two reasons that can cause fetal malformation: one is genetic gene defects leading to fetal malformation, which is most likely to occur in cases of consanguineous marriage or marriage between individuals with family hereditary diseases; the other is non-genetic gene defects causing fetal malformation, which is often due to the neglect of teratogenic factors by the pregnant woman during pregnancy.

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