Thanks for your query.
A single MRI would not have enough radiation to cause significant damage to the fetus.
ALso, having multiple levels of spondylitis
would definitely lead to risks in normal vaginal delivery
, as well as risks in having spinal anesthesia
for C section.
You need to have an expert Orthopedic opinon to know for sure the possibility of difficult labour and risks during operative or vaginal delivery.
YOu can safely go for one MRI , as a single exposure would not cause any damage.
Continue taking regular folic acid
supplements in pregnancy.
Take care, and feel free to ask further questions.