What does it look like when an early pregnancy test shows a false negative?

Patient's question:

No

Doctor's answer:

Negative: Only the control line appears, indicating no pregnancy;
2. Weak positive: Both the control line and the test line are colored, but the test line is lighter than the control line, indicating a possible pregnancy. Please retest with morning urine the next day;
3. Positive: Both the control line and the test line are colored, and the test line is clearly visible, indicating pregnancy;
4. Strong positive: Both the control line and the test line are colored, but the test line is darker than the control line, indicating pregnancy for a certain period of time;
5. Invalid: No colored lines appear, indicating the test is invalid or failed.