Hello dear,I understand your concern.In my opinion heartburn is routinely seen in.pregnancy due to hormonal effect and iron medication.I suggest you to take antacids and take food in small quantities every 2 hourly.Also iron preparation can be changed to the one causing less gastritis.Also take iron tablet at night before going to bed.If oral iron is really causing problem you can take iron injections.Dont worry. Best regards...Dr.srilatha