A pregnancy test , in an IVF cycle, is generally scheduled approximately two weeks after an embryo transfer. This involves a blood test to measure the hormone of pregnancy - hCG (human chorionic gonadotropin). If positive (greater then 5 mIU/ml) the test is repeated two days later and it should rise appropriately. Initial studies had suggested that in naturally conceived pregnancies, the 2-day rise should be at least 66%. A slow rise was believed to be associated with an abnormal intrauterine pregnancy or a tubal pregnancy. More recent studies have shown that the rise could be as slow as 53% in 2 days and the pregnancy could still turn out to be normal.