From Robin Elise Weiss, LCCE,
Your Guide to Pregnancy & Childbirth.
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A. Most pregnancy tests will tell you to read the results in a certain amount of time, usually from a couple of minutes up until 10 minutes later. So you may take a pregnancy test and read it within the above time period as negative.

If you happen to be like many women and keep the test around to look at later, you may notice that after that allotted time the test now appears to have a positive result. This is called an evaporation line. It is not indicative of a positive pregnancy test.

If the negative test results was unexpected or your tested prior to your missed period. Repeat the pregnancy test when you have missed your period.

More Questions on Pregnancy Tests

• What kind of medicines effect the pregnancy test?
• If I take a test too early can it be wrong?
• What is an evaporation line?
• How long should I wait between tests?
• Will an IUD alter a pregnancy test?
• What is a false positive?
• Do I have to use first morning urine?
• Pregnancy Tests More questions about pregnancy tests.
• 25 Signs of Pregnancy

_{Updated: 7/4/07}