Before the advent of ultrasounds and sonograms, a miscarriage was usually diagnosed alongside bleeding and the beginning of the pregnancy expulsion process. Today, the medical profession may use ultrasounds to identify the loss of a pregnancy. This finding may be titled an "early pregnancy failure." Most miscarriages occur in the first trimester, before the pregnancy has entered the 12th week. These sorts of ultrasounds may show that the uterus is clear of tissue of the fetus.