A pregnancy test can usually show a positive result 10-14 days after sexual intercourse, but the time to show a positive result varies from person to person depending on their body type. The principle of pregnancy tests, such as pregnancy tests, is to determine whether a woman is pregnant by detecting the level of human chorionic gonadotropin in the urine. The test is recommended to be done using clean mid-morning urine and can be done as early as a few days after the fertilized egg has been laid. Meanwhile, for patients with lung cancer such as clear cell carcinoma of the kidney, hyperemesis gravidarum, small cell lung cancer, etc., the test may be positive even if they are not pregnant after sexual intercourse; some patients may have a negative test after they become pregnant but have delayed menstruation, vomiting and other obvious symptoms of pregnancy, which are confirmed to be pregnant after the test. It should be noted that to determine whether you are pregnant, you need to go to a professional medical institution for testing to determine whether you are pregnant or not, and testing only through the test paper is not accurate.