Pregnancy tests work by detecting the presence of a hormone called human chorionic gonadotropin (hCG), which is produced by the developing placenta soon after the embryo implants in the uterine lining. The amount of hCG in your body increases quickly once implantation occurs. Answer pregnancy test, like others, measures the hCG in your urine. The amount of hCG required for most pregnancy tests is about equal to the amount present in the urine of most pregnant women about 8 to 11 days after conception - approximately the first day of a missed period. First morning urine is preferred, as it will have the strongest concentration of hCG.
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There are a couple of different varieties of Answer pregnancy test. The Answer Quick and Simple One-Step can be used up to three days before a missed period. The basic Answer test is designed for use starting the first day of a missed period. Both are conducted by urinating on a wand (or, alternatively, collecting urine in a cup and then immersing the wand in it.) The Answer test is reported to be 99% accurate, though there are reports of a greater likelihood of false positives with the Quick and Simple One-Step. A false positive would indicate you are pregnant when, in fact, you're not.
Both versions of Answer pregnancy test indicate pregnancy through the presence or absence of pink lines. Hold the test wand in the urine stream (or dip in a cup or urine) for 5 seconds, then lay the wand flat for two minutes. If one pink line appears in the test window, the test worked but you are not pregnant. Two pink lines indicate pregnancy. The absence of any lines means the test did not work.
The Answer pregnancy test is one of the less expensive tests available. Reviews by those who have used it describe it as a fast, reliable, and accurate no-frills test.
A final point to consider with an Answer pregnancy test or any other: in some pregnancies, the embryo takes longer to implant, sometimes not until the first day of a missed period. A pregnancy test taken that first day would come up negative because there is no hCG present to be detected. If your first test is negative but your period doesn't start within a few days, test again. There may still be two pink lines in your future.