A non contrasted MRI should be quite safe in pregnancy. You can read these articles to find out more. If in doubt, always discuss the pros and cons of investigations and their modality with your physician. The choice of test will be determined in the best interest of both mother and baby. https://www.radiologyinfo.org/en/info/safety-mri-pregnancy https://radiology.ucsf.edu/patient-care/patient-safety/ct-mri-pregnancy#accordion-pregnantemployees-inmri-environment