The shortest number of days of pregnancy that a pregnancy test stick can detect is an important moment in a woman’s life, and the pregnancy test stick is one of the tools to confirm whether she is pregnant. So, what is the minimum number of days of pregnancy that a pregnancy test can detect? How to use a pregnancy test and ensure its accuracy? This article will explain these issues. The principle and accuracy of the pregnancy test stick The pregnancy test stick uses progesterone in the urine to determine whether you are pregnant. After pregnancy, progesterone levels will gradually increase. Pregnancy tests detect urine through a chemical reaction on the test paper