How does the test strip sometimes show two lines and sometimes only one? What is it really?

Patient's question:

No.

Doctor's answer:

Hello, after your menstrual cycle is delayed by 7 days, use a pregnancy test kit, preferably testing with the first urine of the morning. The test method must be strictly followed according to the instructions on the test kit. The results should be observed within 5-15 minutes. Observing the results after this time will not be accurate.

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