Fourteen days after coitus measured no pregnancy, if it is a pregnancy test stick measurement may not be allowed, if it is a blood test, it is more accurate. After intercourse, if you are pregnant, generally in two weeks time, the fertilized egg has completed the implantation, at this time there will be chorionic gonadotropin secretion. If you use a pregnancy test stick to detect, may be due to the quality of the test paper or operating irregularities and other reasons appear false negative results, this time is not allowed. However, if you take a blood test, you can detect the level of human chorionic gonadotropin in the blood, which is more accurate. If there is a delay in menstruation fourteen days after intercourse, then the possibility of pregnancy is greater, it is recommended to go to the hospital in time, under the guidance of the doctor for standardized examination, to determine whether pregnancy has occurred.