Pregnancy can be detected with a blood test about 10 days after conception. A woman who is ovulating and arranges intercourse has a high chance of conceiving. The earliest way to detect pregnancy after conception is through a blood test, which is done by drawing blood from a vein about 10 days after conception. The blood test measures the value of HCG (human chorionic gonadotropin) in the blood to determine if you are pregnant. This value rises after conception to indicate pregnancy. The number of days needed for the test varies, and if the early pregnancy test is done, it can be done about 10-14 days after the menstrual period has been delayed, to check if you are pregnant. Note that the occurrence of menopause is the first manifestation symptom of pregnancy, and it is important to go to the hospital in time to confirm the diagnosis.