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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.
Home pregnancy tests come in many different types. Most stores sell them over the counter (without a doctor's prescription). The cost varies depending on the brand and how many tests come in the box. Accuracy. Most tests can be taken as soon as you miss your period. Some newer, more expensive tests say they can be used 4 or 5 days before your period.