Thanks for the query.
Menstruation is a natural phenomenon where there is a collection of menstrual blood in the uterine cavity which is the endometrium that is shed and it is thrown off through the vagina to the outer environment for a few days. After menses, the uterine cavity is clean and new endometrial lining starts to grow. There is unlikely for fluid to accumulate in the uterus due to a period or after a period.
Hope this helped.
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