Home pregnancy tests measure human chorionic gonadotropin (hCG) in your urine. hCG is produced in measureable amounts at about 7 - 10 days after conception. However, it is generally recommended that you wait 14 days (the day your period would normally show) before you test. (This is typically 28 days since your last menstrual period (LMP)).
There is also the question of how much hCG do each of the test measure. Some tests record as little as 25 mIU of hCG while others measure 250 mIU of hCG. Obviously the more sensitive the pregnancy test, the sooner you will have an accurate answer.
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