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All pregnancy tests work by detecting the pregnancy hormone, hCG, in the urine or blood. This hormone is present only when a woman is pregnant. If the pregnancy test detects hCG, it will say you are pregnant.
hCG is made when a fertilized egg implants in the uterus. This usually happens about 10 days after conception (when the man's sperm fertilizes the woman's egg).1 The amount of hCG builds up quickly in your body with each passing day you are pregnant.
So if you take a home pregnancy test too soon after implantation, your hCG level may not be high enough to detect the pregnancy. If the test says you are not pregnant, take another pregnancy test in a few days.
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