I had low iron with my first and had to take iron supplements too. My levels were fine after that though, And I don't really know what could happen if they stay low.
I've had low iron throughout my whole pregnancy and have been on iron pills but I stopped taking them because they made me sick well just yesterday I was put in the hospital due to my blood count being so low I needed a blood transfusion and they had to give me 2 bags of blood just to get my blood count back up so my advice would be take the iron pills and your levels should go up
I have low iron an take medicine for it an I have stopped taking it for a couple of weeks today doc say I need to take 3 now I was taking 2before but I believed I had low iron before I got pregnant