The success rate of fertility preservation in women with fluid in the uterine cavity in early pregnancy is around 60-70%. A small amount of fluid in the uterine cavity is due to the rejection reaction of the endometrium when the embryo settles in the early stage of pregnancy, which is mostly indicative of preeclampsia. If the endometrium is able to absorb the fluid on its own and does not affect the growth and development of the fetus, the fluid in the uterine cavity will be gradually absorbed as the fetus grows and develops, and regular rechecks will be sufficient. If a woman has a lot of fluid in the uterine cavity, which affects the growth and development of the fetus, it may lead to embryonic arrest, spontaneous abortion, etc., and also cause infection in the uterine cavity. Therefore, when a woman has fluid in the uterine cavity, she needs to be given more nutrition, proper rest, and medication to protect the fetus, so that the fluid in the uterine cavity can disappear as soon as possible, which is conducive to the growth and development of the embryo.