What is the reason for a false positive test result on a test strip?

Patient's question:

This month, my period was delayed by several days, and I was afraid I might be pregnant, so I bought and used an early pregnancy test myself. The result showed two lines, which clearly indicated pregnancy. However, when I went to the hospital for a check-up, the doctor said after the examination that I was not pregnant and that the test result was a false positive. It truly made me feel like I had a false sense of joy.
What kind of help do I need: What is a false positive?

Doctor's answer:

Some women find out they are pregnant after taking a pregnancy test, but when they go to the hospital for confirmation, the doctor informs them that they are not pregnant. The pregnancy test showed a false positive.

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