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Most doctors recommend that you wait until the first day of your missed period before taking a home pregnancy test. A missed period is usually one of the first signs of pregnancy. This is usually around two weeks after conception. However, some tests are more sensitive than others and can be taken earlier. Concentrations of hCG are reported in milliInternational Units (mIU) or amounts equal to 1/1000th of an IU per milliliter.
Detecting Pregnancy Before You Miss a Period. Women who take pregnancy tests too early often donât have high enough levels of hCG in their body for accurate detection. The most accurate time at which you could take a pregnancy test is if you take one around the time of your period. Negative results can sometimes occur because you arenât actually pregnant, or because you might be ovulating later than you think.