What is the reason for one line being slightly lighter in early pregnancy two-line tests?

Patient's question:

No.

Doctor's answer:

Test strip shows weak positive: both the control line and test line are colored, but the test line is less colored than the control line, indicating a possible pregnancy. Please retest with morning urine the next day. Early pregnancy test strips do have some margin of error. If you suspect pregnancy, it's best to have a detailed check-up at the hospital. You can also make plans early. You can check blood HCG 7-10 days after intercourse to confirm pregnancy. This is the most accurate and earliest method of testing.

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