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The purpose of this study is to identify a systemic immunological profile specific to patients with recurrent implantation failures (RIF) or miscarriages (RM) through blood immunophenotyping on the day of ovulation. This study also aims to determine whether the intrauterine administration of 5 million peripheral blood monocluear cells increases implantation and pregnancy rates in patients with RIF and decreases the risk of miscarriages in patients with RM, compared to what has already been published in the scientific literature

Inclusion Criteria:

• All women aged 18 and over undergoing an IVF cycle with her partner's sperm at the Fertilys fertility center, without a RIF status, agreeing to participate in the study and having signed the consent form to participate in the study.
• All women aged 18 and over undergoing an IVF cycle with her partner's sperm at the Fertilys fertility center, with a RIF or RM status, agreeing to participate in the study and having signed the consent form to participate in the study.

Exclusion Criteria:

• Women who need a gametes donor (eggs and / or sperm).
• Women undergoing an IVF cycle with frozen sperm.
• Women with autoimmune disease.
• Women with diabetes.
• Women with a history of chemotherapy treatment.