We recommend that you meet with a genetic counselor to discuss the risk of recurrence for spina bifida or other birth defects within your family. A genetic counselor is trained at assessing the risk based on personal history, family history, and any applicable genetic and non-genetic tests results. A genetic counselor can also review the implications of MTHFR gene variants and recommendations for before and during your next pregnancy.
You can find a genetic counselor at the National Society of Genetic Counselors website or through companies like mine, AccessDNA. You can find more information on spina bifida at AccessDNA as well.
Your geneticist is the only professional who can answer these questions.