The last trimester at the end of pregnancy is also a risk period for miscarriage. Women in pregnancy should be vigilant to avoid miscarriage. 1. The risk period of miscarriage and the causes of miscarriage explain the risk period of spontaneous miscarriage. It is mainly in the first trimester of pregnancy. This kind of natural miscarriage is mostly due to fetal chromosomal abnormalities, which is a period of natural elimination. 466 Hospital gynecologists believe that if the natural elimination is not due to fetal chromosomal abnormalities, but due to the pregnant woman’s own problems that lead to miscarriage, the fundamental plan is to find out the problem and then you can prescribe the right medicine in order to avoid another miscarriage. The last trimester of pregnancy is also a dangerous period for miscarriage. Since the fetus is already quite large at this time, most of the premature births occur not because of the fetus but because of the physical condition of the pregnant woman, so the doctor will adopt a strategy to keep the fetus in the mother’s body as long as possible until the expiration of the due date. Most of the pregnant women with the need for a safe pregnancy belong to the middle and late stages of pregnancy. 2.The main signs of miscarriageThe main signs of miscarriage. Vaginal bleeding: vaginal bleeding during pregnancy is not normal and should be alerted. According to statistics, if vaginal bleeding occurs in the first trimester, about half of pregnant women can continue to have a successful pregnancy, about 30 percent of pregnant women will have a spontaneous miscarriage, five percent will have an ectopic pregnancy, and a very small number of pregnant women will have a gravid pregnancy or disease. If a pregnant woman feels that her uterus is contracting more and more frequently, even to a regular and intensive contraction every 10 or 20 minutes, or if she feels pain during the contraction, she should pay special attention to it; back pain, abdominal drop: when a pregnant woman feels soreness in her back and a heavy feeling of abdominal drop, she should seek medical examination if this situation persists; early water breakage: when a pregnant woman has a rupture of the amniotic membrane, amniotic fluid flow, dilatation of the cervix, and the uterus is dilated, she should seek medical attention. Early water breakage: When a pregnant woman has preterm labor such as rupture of amniotic membrane, amniotic fluid flow, dilatation of cervix, contraction of uterus and bleeding, she should seek medical attention as soon as possible; Infection: It can be divided into urinary tract infection and reproductive tract infection. Urinary tract infection will have signs such as frequent urination, fever, pain when going to the toilet, discharge often foul-smelling, itchy pubic area.