Cohort of Patients Presenting Unexplained Recurrent Miscarriages and Identification of Early Miscarriage Recidivism Factors

If the patient accepts the ancillary study, a blood sample will be taken (1 EDTA tube of 3 ml and 2 lithium heparin tubes of 10 mL each) for lymphocyte immunophenotyping in flow cytometry on fresh blood and for the constitution of the biological collection (plasma/mononuclear cells).