It is possible that a history of miscarriage may not be detected on a pregnancy test for an early miscarriage, but it is partially detectable if the miscarriage is a major one. Generally, it can be seen whether there is a history of miscarriage from the following aspects: 1. During the gynecological examination, a change in the cervical opening in the shape of a zigzag can be seen, indicating that there has been a full-term birth or a large-month miscarriage. For early miscarriages before the third trimester, a history of miscarriage is usually not visible during the pregnancy test. 2. In addition, after the middle of pregnancy, some pregnant women will appear abdominal stretch marks, if the pregnancy test found that the pregnant woman’s abdomen has a number of white stretch marks, generally represents the ever had a large-month miscarriage or childbirth. If it is a large-month miscarriage, such as more than three or four months of pregnancy, sometimes you can see the history of miscarriage. But the miscarriage is if the pregnancy was ended early in the pregnancy, either by accident or by abortion. In this case the fetus is not very large and the miscarriage does not affect the woman’s original structure too much, so pregnancy tests do not detect it.