Non-interventional Study of Therapy for Threatened Miscarriage

Inclusion Criteria: * Signed informed consent of the patient to participate in the study; * Women aged 18-35 years; * Progressive uterine pregnancy at the time of inclusion in the study from 8 to 22 full weeks; * Drawing pains in the lower abdomen, lumbar region; * Scanty blood discharge from the genital tract; * Palpitation of the fetus revealed by ultrasound; * Prescription by attending physician of Utrogestan or Duphaston, depending on chosen treatment tactics. A physician should decide on the therapy, as well as tactics of further management of pregnancy before the patient is enrolled in the study and regardless of it. Exclusion Criteria: * Stimulated ovulation, use of assisted reproductive technologies; * Abnormalities in the structure of the uterus; * Amputation of the cervix; * Uterine myoma with submucosal location of the node (a clinically significant size); * Karyotype anomalies of parents (if applicable); * Aneuploidy, anembrion, fetal malformations, as established causes of loss of previous pregnancies; * Congenital thrombophilia: factor V gene mutation (Leiden mutation), mutation of the prothrombin gene (if applicable); * Non-developing pregnancy; * Other clinically significant causes of miscarriage identified during examination (including but not limited to): pre-pregnancy diabetes, pre-pregnancy uncompensated thyroid dysfunction, history of malignant tumors or current tumors, psychiatric illnesses; * STDs at the time of inclusion in the study; * Administrat…