Pregnancy can be detected on the 14th day of pregnancy. It is advisable to take a blood test at the gynecology department to clarify whether conception has occurred. Fourteen days of pregnancy generally refers to fourteen days after intercourse. If conception is successful, it means that the fertilized egg has completed its implantation and the hCG index in the body is already elevated at this time. Usually, the detection of human chorionic gonadotropin in blood is more accurate and earlier than the detection of human chorionic gonadotropin in urine. If the test is performed with early pregnancy test paper or pregnancy test stick, the test may be weakly positive due to the short time interval; or the test result may be inaccurate due to the slow rise of hCG index, which cannot detect pregnancy. Therefore, it is recommended that women go to the gynecology department of the hospital to have their blood hCG index checked to clarify the results. In addition, after confirming pregnancy, it should also be noted that pregnant women are prohibited from having sex in the first trimester to avoid pre-eclampsia miscarriage, while pregnant women should take folic acid supplements in time to prevent fetal neural tube abnormalities.