Usually, pregnancy can be detected by drawing blood for hCG in the blood about 7-8 days after intercourse. Testing for human chorionic gonadotropin in the urine or drawing hCG in the blood and observing if it increases both can clarify whether or not you are pregnant. After the 6th to 7th day after fertilization, the fertilized egg will be laid and the hCG in the woman’s blood will gradually increase in the early stage, and at this time, the blood hCG check can detect whether or not she is pregnant. However, in the early stages of pregnancy, the blood hCG level is usually low and is prone to false negatives. In order to further improve the accuracy of the test, it is recommended to take another blood test 10-14 days after intercourse to be more accurate. Therefore, women can determine whether they are pregnant by combining the time of intercourse and whether there are other symptoms, and they should pay attention to rest, relax and eat reasonably in the early stage of pregnancy, while taking folic acid supplements as prescribed by the doctor.