What is the earliest you can take a pregnancy test to find out if your pregnant?

Pregnancy tests measure the levels of human chorionic gonadotropin (hCG) in urine or blood. hCG is a hormone that is produced by developing placenta. It is typically detectable in the blood as early as 6-10 days after fertilization and in urine 10-14 days after fertilization. The most sensitive pregnancy tests can detect hCG levels of 5-10 mIU/mL in urine. This means that a pregnancy test could potentially be positive as early as 14 days after fertilization. However, it is important to note that early pregnancy tests are not always accurate, and it is best to wait until at least one week after a missed period to take a pregnancy test for the most reliable results.