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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.
After a week of delay, hCG levels will be high enough to be detected. Wait for 21 days to take a pregnancy test after intercourse to be 100% sure of the result if you have a regular menstrual cycle. If you choose to do the pregnancy test the first day after a missed period and it is negative, then wait a little longer.