Ladies who had low iron

So I'm a panic freak. Lol I have severe anexity. I passed my sugar test but doctor said my iron was a little low, so he prescribed me iron pills, they are 325mg now I look up everything and idk how I feel about taking 325mg of iron, on top of the 28 my of iron I'm getting from my prenatals. Considering iron poisoning is a real thing and dangerous.
I was just wondering if you ladies could help me out for whoever was told to have low iron what iron pill were you prescribed and what milligram. I want to start then but I won't take them without having some feedback.
Thanks in advance ladies