MRIs are not radioactive and can be performed during pregnancy preparation, even when many women need an MRI if they have problems during pregnancy. An MRI can usually be performed after 20 weeks of pregnancy when problems arise, including placental problems, fetal problems or tumors. In individual cases, MRI may also be performed after 18 weeks of pregnancy. MRI has less impact on the fetus and, unlike CT, the test is not radioactive and usually has no impact during early pregnancy. However, the early pregnancy period is generally a time of rapid child development, so even if it is not harmful, an MRI should not be performed casually. In short, MRI is usually done after 20 weeks of pregnancy, i.e. after 5 months of pregnancy, and only when it is necessary to do MRI. In other cases, B ultrasound is usually sufficient, and the impact of B ultrasound is less than that of MRI. Also, only general MRI is usually done, such as plain scan of MRI, without strengthening, i.e., as little as possible, to reduce the possibility of accidents.