Thanks for your query.
is given in the preconception periods to avoid neurological defect in the baby . So it is good for you & your would be baby. Iron taken is not fully absorbed,a part of it is excreted in the stool ,which becomes dark colored. So there is nothing wrong in it .continue with the treatment.
‘Hope I have answered your query, I will be available to answer your follow up queries, “Wish you Good Health and trouble free speedy recovery”