Inclusion Criteria:  Patients with female age 18≤40 years. Patients who provide written informed consent to participate in the trial and for the use of their anonymized data in research. Patients with <2 previous IVF treatments. Patients with ≥1 blastocyst cryopreserved.  Exclusion Criteria:  Patients with female age >40 years Patients with female BMI ≥30 kg/m2. Female patients with insulin dependent diabetes or non-insulin dependent diabetes mellitus and female patients with gastrointestinal, cardiovascular, pulmonary, liver or kidney disease. Female patients with any contraindications or allergies to the drugs used in routine freeze-all-IVF. Patients with untreated intrauterine anomalies and tubal pathology. Patients undergoing PGT-A (aneuploidy) or PGT-M (monogenic disorders) Patients with no blastocysts cryopreserved.