Prompt by own experience, it is how much possible to believe the test or dough on it is pregnant...

[Katya]

Prompt by own experience, it is how much possible to believe the test for pregnancy.

[olga]

On 99, 9 % If only it or he did not have a period of validity and there were no bad conditions of storage.

[Irina]

Mistakes or Errors happen very seldom. I did not have any.

[Tanja]

And at me all 5 tests for pregnancy have shown negative result. Tests used different and the period of validity at them has not left. And only US has shown pregnancy.