Generally, pregnancy can be detected after 14 days of intercourse, but as each person’s situation is different, the specific situation varies from person to person. If a woman’s menstrual cycle is regular, her ovulation time is fixed, and she has intercourse during her ovulation period, and the sperm and the egg can combine successfully, the fertilized egg will be implanted in the womb about one week after intercourse. After the fertilized egg is laid, the level of HCG (human chorionic gonadotropin) in the woman’s body will gradually increase, and 14 days after intercourse, pregnancy may be detected by using a pregnancy test. If the test is taken 14 days after intercourse and the result shows that there is no pregnancy, it may be that the test was taken too early or that there is no pregnancy. It is recommended to go to the hospital for a blood test for HCG to clarify whether you are pregnant. If you have already passed your menstrual period, you need to consider that your period is delayed due to environmental factors, medication, emotional factors and diseases. It is advisable to seek medical advice as soon as possible if you have delayed menstruation.