The occurrence of one embryonic arrest and one biochemical pregnancy is generally considered abnormal and requires further investigation to determine the cause. The most common cause of embryonic failure and biochemical pregnancy is due to chromosomal abnormality. In addition, it may also be due to ovarian insufficiency, endometrial pathology and various other causes that affect the development of the embryo. If this happens once in a while, you can continue to observe the pregnancy, but if it happens twice in a row, you need to have further tests to find out the cause. If chromosomal abnormalities are determined to be the cause, it is generally recommended that both spouses be tested for chromosomes.