In pregnancy always consult your doctor about possible iodine supplements.

About folic acid/folate. B12 and vitamin D, possibly extra magnesium,, all taken already before pregnancy for sure you know already. HEALTHY food [organic for the most pesticides treatedfood Take regular eggs [choline!!] Avoid all cosmetics and shampoos. Use plain olive soap.

https://www.ba-bamail.com/content.aspx?emailid=38952

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5512679/