A blood test to find out if you are pregnant, and another blood test 48 hours later to check for a doubling of the hcg (human chorionic gonadotropin) value. Early pregnancy can be detected by a blood test 10 to 15 days after intercourse. However, after the blood test confirms pregnancy, it is necessary to repeat the test 48 hours later to see if the HCG has doubled. If the human chorionic gonadotropin has doubled well, it provides a good and important basis for determining whether or not there is an ectopic pregnancy. In addition, the blood can only confirm the diagnosis of pregnancy, can not determine whether it is intrauterine pregnancy, should pay attention to 6 to 7 weeks of pregnancy for ultrasound to confirm the diagnosis of intrauterine pregnancy. Early in pregnancy, do a good job of obstetrics and gynecology on time, if you feel unwell, timely obstetrics and gynecology consultation.