The blood test for pregnancy will produce a report on the same day and does not require fasting. The results of the test are relatively accurate, and it is recommended that pregnant women go to the hospital in the morning to have their blood drawn, so that they can get the report in the afternoon. If a pregnant woman has regular menstrual cycle of 28-30 days, she can have a blood test for HCG within 7 days after intercourse, and if the result is positive, the pregnancy will be confirmed. If her menstrual cycle is irregular, and the time of ovulation and the time of fertilized egg implantation will be delayed, she can have a blood test after 2 weeks of intercourse. Blood test is a faster and more accurate test method, but the test cannot confirm whether the pregnancy is intrauterine, and ultrasound is needed around 4 weeks of pregnancy if you want to know more about the embryo.