1. History of uterine bleeding &gt,2 times in the current pregnancy 2. Having uterine bleeding on the enrollment day 3. History of or having pre-eclampsia, abnormal placental position, preterm labor, fetal growth restriction 4. History of cigarettes smoking, alcohol drinking, recreational drugs 5. Recent immunization in prior 14 days 6. Previous COVID-19 immunization 7. Detection of COVID-19 in prior 90 days 8. Blood transfusion in prior 90 days 9. History of severe drug hypersensitivity 10. Type 1, 2 diabetes mellitus 11. Hypertension 12. Having uncontrollable diseases 13. Immunocompromised conditions, including steroid use 14. Investigators&#039, judgement

1. History of uterine bleeding &gt,2 times in the current pregnancy 2. Having uterine bleeding on the enrollment day 3. History of or having pre-eclampsia, abnormal placental position, preterm labor, fetal growth restriction 4. History of cigarettes smoking, alcohol drinking, recreational drugs 5. Recent immunization in prior 14 days 6. Previous COVID-19 immunization 7. Detection of COVID-19 in prior 90 days 8. Blood transfusion in prior 90 days 9. History of severe drug hypersensitivity 10. Type 1, 2 diabetes mellitus 11. Hypertension 12. Having uncontrollable diseases 13. Immunocompromised conditions, including steroid use 14. Investigators&#039, judgement