RecruitingProcedurePAI-1, tPA, TFPI and HEECs in Uterine HemostasisThe purpose of the study is to learn more about the role of blood clotting factor proteins and cells in menstrual (period) bleeding. The investigators are hoping to identify differences in these proteins and cells in the menstrual blood of individuals with heavy periods compared to menstruating individuals who do not have heavy periods.