When you think you might be pregnant, you usually want to know as quickly as possible. As more and more pregnancy tests advertise that they can tell you, even before you miss your period, you might wonder if that’s true. Many people wonder if they take an early pregnancy test too early can it be wrong? A urine early pregnancy test works by measuring the amount of hCG (pregnancy hormone) in your urine. Typically you need to have missed your period for these to be accurate, particularly a positive result.