Really high levels of Iron

So, I got a call from my midwife the other day to get my bloods for my 10 weeks, I am almost 12 weeks now (my first pregnancy) and she has told me my iron levels are through the roof, I've been changed from pregnancy multi vitamins to just folic acid. And I need to change my diet. I am scared that my levels won't lower further down my pregnancy.  Has anyone else experienced this? And what happened if they didn't lower throughout your pregnancy?