It should be quite accurate at 3 weeks
As you don't say precisely to which ClearBlue you are referring a visit to this site should answer your questions. http://www.clearplan.com/ According to this site a ClearBlue pregnancy test is 99% accurate if done on the day of a missed period or later.
The Clearblue Digital Pregnancy test was first released in September 2008. The one-step Clearblue Digital Pregnancy test makes reading results much easier.
They are over 99% accurate when used on or after the day of your expected period.
The ClearBlue pregnancy tests are 95% of the time accurate. If it comes back positive, then you are definitely pregnant, however if it comes back negative you may still be pregnant, so you may have to take it again in a few days.
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I think pregnancy can be detected as early as 21 days after conception through a test such as ClearBlue, that's whether you are on a period or not.
According to the ClearBlue pregnancy test accuracy results they are: 4 days before expected period= 51% accurate 3 days before expected period= 82% accurate 2 days before expected period= 90% accurate 1 day before expected period =95% accurate the day of expected period =99% accurate
The earliest I have seen is 5 days. According to the ClearBlue pregnancy test accuracy results they are: 4 days before expected period= 51% accurate 3 days before expected period= 82% accurate 2 days before expected period= 90% accurate 1 day before expected period =95% accurate the day of expected period =99% accurate
I am not sure if they have this brand of pregnancy tests in Australia, but in America According to the ClearBlue pregnancy test accuracy results they are: 4 days before expected period= 51% accurate 3 days before expected period= 82% accurate 2 days before expected period= 90% accurate 1 day before expected period =95% accurate the day of expected period =99% accurate
According to the ClearBlue pregnancy test accuracy results they are: 4 days before expected period= 51% accurate 3 days before expected period= 82% accurate 2 days before expected period= 90% accurate 1 day before expected period =95% accurate the day of expected period =99% accurate
I am not entirely sure what you are asking here but...According to the ClearBlue pregnancy test accuracy results they are: 4 days before expected period= 51% accurate 3 days before expected period= 82% accurate 2 days before expected period= 90% accurate 1 day before expected period =95% accurate the day of expected period =99% accurate