Why do two lines appear when using a pregnancy test before menstruation?

Patient's question:

I got married last year. Recently, I've been experiencing lower abdominal pain, especially during my period. I'm very worried about it affecting my fertility, and I'm also extremely sensitive to cold and coldness. Why does a pregnancy test show two lines before my period?

Doctor's answer:

Early pregnancy test strips showing two red lines indicate pregnancy: one in the test area (T) and the other in the control area (C). This means you are pregnant. Early pregnancy test strips showing one red line indicate no pregnancy: only a purplish-red band appears in the control area (C), with no purplish-red band appearing in the test area (T).
Hello, in this case, the placenta of the fetus is generally located on the anterior wall, posterior wall, posterior wall of the fundus, left lateral wall, or right lateral wall. It is generally not located on both the anterior wall and posterior wall simultaneously, nor on the fundus.

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