Can you get an accurate pregnancy test four days before your missed period?

It depends on what kind of pregnancy test you take. Some tests will label their tests as "Results 5 days before missed period" or somethin similar. This means that they are capable of detecting pregnancy four days before your missed period. But keep in mind that each day further away from your "expected period" the test will be less accurate. False negative pregnancy tests are much more common that false positive pregnancy tests. So if you get a negative result four days before your expected period, that may not always mean you are not pregnant.