Pregnancy test paper is also known as early pregnancy test paper, early pregnancy test paper changed after a few hours is a normal phenomenon, it is recommended to observe the results within 5 to 10 minutes.
Early pregnancy test paper is to detect human chorionic gonadotropin in the urine, according to the results of the test to determine whether a woman is pregnant.
Early pregnancy test strips should be used correctly, try to observe the results within 3~5 minutes after the test, do not observe the results after more than 10 minutes, the results will be invalid if left for several hours.
Early pregnancy test paper placed in the air for a long time, after oxidation will change the test results, this time even if the results are positive, but also can not indicate that women are pregnant.
It is recommended to use pregnancy test paper after 14 days of intercourse, and try to choose morning urine to detect pregnancy, the test results will be more accurate.