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The Clearblue Digital Pregnancy test was first released in September 2008. The one-step Clearblue Digital Pregnancy test makes reading results much easier.
Yes. In vitro means, "in glass" or "outside of the body", and In vitro pregnancy test is a test that is performed "outside" of the human body. In vitro fertilization is egg fertilization that is performed outside of the body. All home pregnancy tests are "in vitro".
I would recommend that you re-take the test.
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.
Two lines
ClearBlue pregnancy test is 99% accurate when one used it from the day that her period is due. Therefore to get the most real result one must follow the written instruction carefully which is usually inside in its package.
It should be quite accurate at 3 weeks
The results are displayed on Clearblue fertility monitor sticks through a blue line indicating if one is pregnant or not. The results should be shown in just a few minutes.
In vitro fertilization
An in vivo test is a test in a live subject, as opposed to in vitro tests done in the lab.
Some enzymes behave unnaturally in a test tube (Apex).
Observations are made in a test tube.