Generally speaking, a pregnancy test can be taken 10 days after intercourse, and the longer the time after intercourse, the more accurate the test will be. Pregnancy test is one of the common ways for women to detect whether they are pregnant or not, mainly based on the HCG value in the urine as the test standard. After a woman is conceived, her body will secrete human chorionic gonadotropin, which can flow throughout the body with the blood, and a certain amount of this hormone also exists in the urine. If a pregnancy test shows two lines, it may indicate pregnancy. The accuracy of a pregnancy test is about 85%-95%, and in the early stages of pregnancy, if the HCG level in the body is low, the pregnancy test may show two lines, one dark and one light, which is a weak positive, so you can wait for 1-2 days before taking another test. If you want to get more accurate information about pregnancy, you can take a blood test at the hospital 10 days after ovulation. Although the pregnancy test can be used for early pregnancy test, but in order to make a clear diagnosis, after the test should also go to the regular hospital in time, complete the blood, ultrasound and other tests, in order to clarify whether there is ectopic pregnancy and other conditions.