Seven weeks pregnant checking the uterine cavity with fluid need to keep the fetus about 7 to 15 days, the specific time varies from person to person, need to keep the fetus until the symptoms disappear. The main cause of fluid in the uterine cavity at seven weeks’ checkup is insufficient progesterone, which may be a manifestation of preeclampsia, and requires the use of progesterone gel pills, progesterone injections and other medications under the guidance of a doctor to carry out fertility preservation treatment. If the fluid in the uterus is small, it is usually enough to carry on the fertility preservation treatment for about 7 days; if the fluid in the uterus is large, it is necessary to carry on the fertility preservation treatment for about 15 days; if the symptoms do not show any improvement after 15 days, it is usually necessary to carry on the fertility preservation treatment until the symptoms disappear. Seven weeks pregnant with fluid in the uterine cavity, you need to go to the regular hospital in time for relevant examinations and fertility preservation treatment, to avoid delaying the condition and affecting the development of the fetus.