Benefit of GnRH Agonist Before Frozen Embryo Transfer in Patients With Endometriosis and/or Adenomyosis

Inclusion Criteria: * Women aged 18 to 36 years (women ≥18 years to \<36 years) with endometriosis and / or adenomyosis * Having benefited from In vitro fertilisation /intracytoplasmic micro-injection with freeze all and for whom the frozen embryon transfer of a blastocyst is planned * A normal uterine cavity * An MRI showing endometriosis and / or adenomyosis during the inclusion visit * Having signed a consent form * Being affiliated to a Health Insurance Plan. Exclusion Criteria: * Patient aged \<18 years and ≥ 36 years * BMI\> 35 * History of implantation failures (≥ 2) * Endometrial alterations: synechiae, polyps, myomas, hyperplasia, hematometra * known hydrosalpinx uni or bilateral * MRI showing no endometriosis or adenomyosis * Hypersensitivity to GnRH, GnRH analogues, or any of the excipients of Decapeptyl 3 mg * Known hypersensitivity to estradiol * Known hypersensitivity to progesterone * Known hypersensitivity to acetylsalicylic acid or other nonsteroidal anti-inflammatory drugs * Known hypersensitivity to folic acid * Known hypersensitivity to cefixime or an antibiotic in the cephalosporin group * Known hypersensitivity to levofloxacin or any other quinolone * History of tendinopathies related to the administration of fluoroquinolones * Epilepsy * Hypersensitivity to contrast agents for MRI * Known or suspected breast cancer or history of breast cancer * Known or suspected genital tract cancer or history of genital cancer * known or suspected estrogen-dependent malignant neoplasms * Undiagnosed genital haemorrhage * Untreated endometrial hyperplasia * History of idiopathic venous thrombo-embolic accident or evolving venous thrombo-embolic event (deep vein thrombosis, pulmonary embolism) * Recent or evolving arterial thromboembolic stroke (eg angina, myocardial infarction) * Acute liver disease or history of liver disease, until hepatic tests are normalized * Severe renal insufficiency * Severe, uncontrolled heart failure * Evolutionary gastroduodenal ulcer * History of asthma caused by the administration of salicylates or substances of similar activity, especially nonsteroidal anti-inflammatory drugs * GnRH Agonist Decapeptyl administered within 6 months prior to transfer * To be deprived of liberty or under guardianship * Pregnancy and breast feeding.