5mg Folate and iron supplements during beta thal pregnancies

Hi everyone! I'm a beta thal and with a history of preterm labor, hoping for a full term healthy baby.
I found these two studies telling us that we need:

5mg folate not the 1mg that prenatal vitamins usually have
And not avoid iron supplements during pregnancy.

 Studies:
http://www.ncbi.nlm.nih.gov/m/pubmed/2599250/
http://www.ncbi.nlm.nih.gov/m/pubmed/1164611/?i=2&from=/2599250/related

Please check with your doctors, I know I'll ask mine tomorrow.

Best wishes and prayers for everyone!