How accurate is it that early? Here are the results from one study:

One day past your expected period: detected 100 percent of pregnancies

On the day of your expected period: 96 percent of pregnancies detected

On the day before your expected period: 93 percent of pregnancies detected

Two days before your expected period: 81 percent of pregnancies detected

Three days before your expected period: 68 percent of pregnancies detected

Four days before your expected period: 42 percent of pregnancies detected

Five days before your expected period: 33 percent of pregnancies detected

Six days before your expected period: 25 percent of pregnancies detected

So those are your chances of course it goes that it's like 99.9% of people but in their study it got it right every time and found digital FR about as accurate as FRER.

How do these statistics compare to other brands? According to this same study, E.P.T manual tests (not the digital one) detected only 53 percent of pregnancies on the day of a woman's expected period. The First Response Early Results test was more accurate three days before a woman's expected period than E.P.T.'s test was on the day of the expected period.