There are many factors that can cause the low position of the pregnancy sac in women, and it may be caused by the following reasons: first, it is related to the woman’s uterine surgery, if the woman has had several abortions or scraping operations, it will lead to a thin endometrium, which may cause the low position of the pregnancy sac. Secondly, if a woman belongs to a scarred uterus, the placenta may also appear to be in a low position. Third, it may also be caused by gynecological diseases such as uterine fibroids. Fourth, it may also be caused by genetic factors. Fifthly, it is also related to the frequent exposure of pregnant women to harmful substances, such as long exposure to radiation and formaldehyde. The low position of the gestational sac is more dangerous and may lead to the phenomenon of pre-miscarriage, so you must pay attention to more rest during pregnancy, do not overwork and need to supplement nutrition.