The presence of brownish discharge coming out of the pregnant woman suggests the presence of some fluid inside the uterine cavity. This is because when there is endometrial inflammation, it can cause fluid to build up around the gestational sac, and brown discharge can occur. For example, when there is a preeclampsia, due to low progesterone, including low blood HCG, can not meet the needs of the normal body, so there will be brown discharge occurs. Excessive exertion or coitus during pregnancy, for example, can also cause brown discharge. For example, when there is a poor quality of sperm or egg, which results in poor development of the embryo, there will also be brown discharge. When there is a brown discharge, it indicates that there is a chance of preterm miscarriage. Therefore, a series of tests should be carried out to ensure the stability of the fetus, and if necessary, oral medication should be taken to protect the fetus to avoid miscarriage.