Anemia

It was no surprise to be when my blood results came back from my first doc appt that I had 2/8 showing I was anemic. Aside from the prenatal pills that I’m already taking that have iron, my doc started me on straight iron pills (1 a day before bed time). I am extremely constipated! Stool softeners are not working and I do not want to take a laxative I ready it’s bad during pregnancy. Any recommendations are appreciated. I’ve tried: prune juice, dry prunes, fiber smoothies, green juice (celery, spinach, ginger & cucumber)… I’m miserable! Help!