I have always heard of needing iron during child bearing years. And the older folks stressed proper nutrition. My generation/socioeconomic group ate a lot of meat. We followed the American trend at the time. Now we realize that we need 75% fruits, veggies, grains, etc. There is definitely something there.
Odd how they keep recommending spinach as a source of iron when recent articles keep stating that something in spinach interferes with iron absorption.
Or TOO HIGH IRON. I did five years of IVF without success and with hindsight found I had hemochromatosis, previously I had repeated miscarriages....Iron maybe a factor, but what is key - is yours in the right range. Also does it stay in the right range after becoming pregnant.