Is 20 days after sex too early to take a pregnancy test?

No, 20 days after sex is not too early to take a pregnancy test. Most pregnancy tests can detect the presence of the pregnancy hormone human chorionic gonadotropin (hCG) in urine as early as 10-14 days after conception. While the level of hCG increases as pregnancy progresses, a test taken 20 days after sex should be able to provide an accurate result.

However, it's important to note that some factors can affect the accuracy of a pregnancy test, such as the sensitivity of the test, the time of day the test is taken, and the individual's hydration level. For the most accurate results, it is recommended to wait until at least one day after the expected period has missed before taking a pregnancy test.