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Home pregnancy tests are usually about 97% accurate, but this varies from brand to brand. In order to get the most accurate results, it is a good idea to wait for about a week after your period is due before testing. This allows more hCG to build up in your urine, which will allow for a more accurate test.
Pregnancy tests will catch less than 70% of pregnancies at 4 days before a period. A few things to understand about pregnancy tests. When they say you can test up to 5 days before a missed period, that means 4 days before your period is due. That number is based on an average luteal phase (the time between ovulation and the first day of your period) of 14 days. Which means those tests recommend testing no sooner than 10 days past ovulation.