Blood tests for early pregnancy do not require an empty stomach, so you can go to the hospital in the morning or afternoon to have your blood drawn and tested depending on your personal situation. The two most common clinical methods for detecting early pregnancy are: first, urine test with early pregnancy test strips, and second, blood test for HCG. The urine test is simple and convenient, but it can only be detected after more than one week of menopause. The blood HCG test is not only accurate but also sensitive and can detect pregnancy about a week after the union of the sperm and egg. Because blood HCG is not only accurate but also sensitive, this test is now mostly used in clinical practice. Blood HCG is a radioimmunoassay to test the level of HCG in the blood, so no fasting is required. A positive result of urine HCG and blood HCG indicates pregnancy. However, to determine if the pregnancy is intrauterine, an ultrasound should be done at the right time, which is usually recommended at 5-6 weeks of menopause.