Iron levels are very important. My iron levels were checked before my hb, but somehow, no one looked at the results properly.
I had the homebirth, and five days later could still not walk down the stairs without feeling faint.
My midwife took blood and my heamoglobin was 8.(normally it should be 13 - 15 iirc).
I took iron tablets but it took 4 months to completely regain my strength.
It is very important to have a good iron level before giving birth, otherwise blood loss during birth can be dangerous.