Comparison of Fetal Thymus Volumes of Pregnant Women With In Vitro Fertilization (IVF) and Spontaneous Pregnant Women.

Inclusion Criteria: * pregnant between 18-24 weeks * had no complaints * between the ages of 18-35 * conceived with in vitro fertilization or spontaneously Exclusion Criteria: * history of endocrinopathies (including diabetes mellitus, hyperprolactinemia, Cushing's disease, and congenital adrenal hyperplasia), systemic diseases (e.g. asthma), collagen disorder, hypercholesterolemia, sickle cell anemia, or neoplasm, * those who had a history of coronary artery disease, angina, or myocardial infarction, or a history of hypertension, coronary arteritis, and electrocardiographic changes that suggest any known history of vascular, infectious, or inflammatory disease, maternal autoimmune disease, * use of any drugs other than those used for IVF (e.g. insulin sensitizing drugs, oral contraceptives, antiandrogens, statins, aspirin, and corticosteroids) in the 3 months before the pregnancy, * multiple pregnancy, * present cigarette and alcohol use, * abnormal renal, hepatic, and thyroid function test results; * refusing to participate in the study, * abnormal fetal findings (fetal anomaly, increased nape transparency, first-second trimester screening test disorder), * cases who did not meet the criteria for pregnancy after the first tube treatment (ICSI-ET) because of normoresponder, unexplained infertility, or male factor