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If pregnancy tests are left for a while, they can look as if they have produced a positive result. Most tests have a time window in which to read the test for this reason. It might say to read the test within ten minutes of doing it or similar. Always take notice of the time given, and only trusts results within that time frame. At twelve weeks, it would be most unusual to only be showing a faint positive. Blood tests are always quite reliable - more so than the home tests - so if they repeatedly give a negative result, then you can be fairly certain that you are not pregnant.

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Q: If you've 2 negative blood tests and all home tests are negative on birth control and have periods monthly why would 2 of the home tests be negative 1st and faintly positive 3 hours later at 12 weeks?
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