Can pregnancy tests be 100% accurate?

Patient's question:

Sure, here is the translation of the provided content into English:
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No
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Doctor's answer:

The result depends on the time of pregnancy. Result determination:
1. Negative: Only the control line appears, indicating no pregnancy;
2. Weak positive: Both the control line and test line are colored, but the test line is lighter than the control line, indicating possible pregnancy. Re-test with morning urine the next day;
3. Positive: Both the control line and test line are colored, and the test line is clearly visible, indicating pregnancy;
4. Strong positive: Both the control line and test line are colored, but the test line is darker than the control line, indicating pregnancy for some time;
5. Invalid: No colored line appears, indicating the test is invalid or failed.

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