@AliceRR anaemia is pregnancy is a strange one. I have had to have an iron infusion the other week. So am ok now. But the dr explained it as.
Because of blood loss during labour they over compensate and the acceptable level is alot higher than non pregnant people.
The level thats the bench mark also increases each week in pregnancy as due date gets closer.
So said whilst I am fine again now. In a couple weeks I could be anaemic again. (Hope this sort of makes sense? As its a bit weird and confusing how they do it)
But maybe its something simular where you are border line and they are just covering themselves kind of thing.
Your midwife should monitor your iron levels anyways? So sure it would flag up then.