when is the soonest i can get a positive pregnancy test
Currently, the earliest pregnancy test is First Response Early Response, which can be taken from 5 days before your period is due. But the accuracy of the test at that point is only 62% - not a lot more than tossing a coin.
The most interesting result is the nearly perfect match between the average first positive test result day and the day of the expected period. The average day to get a positive test is at 13.6 DPO and the average luteal phase length is 14 days (verified on our sample as well).