Low iron ?

Hello ladies, 
When I first found out I was pregnant, my doctor told me I was low on iron and that I needed to take an iron supplement aside from my prenatal vitamins to prevent anemia. She mentioned I needed to take 65 mg of Iron daily plus my prenatal. Now, the obgyn is telling me not to take iron supplement. I have been taking like 90 mg of iron daily seems like a lot to me. Any of you on this dose ?