My doc told me the same thing, slightly anemic, I am on 325mg it hasn't made me constipated but did make my poop like a blackish green and has not made me nauseous as of yet and I have been on them for a few weeks now. Hope that helps answer ur question, good luck hun!
Did they make you nauseated ? Also do you remember your dosage, the one I was given seems extremely high if I'm only slightly anemic
The iron tablets i got put on after my section because i lost a lot of pv blood, it soaked the bed through the pads and everything :-( theres not many side effects from iron tablets except they may make you a bit constipated and they will definitely make your poop black. I can't help you with the anterior placenta part though Im afraid x