You could probably google it Ally, but I was asking my midwife about this today.

Umm...(now to just get preggo brain to co-operate). Tiredness, dizziness, paleness, whiter on gums and in that bit under they eyeball...
there might have been more.

But lots of those symptoms can happen in pregnancy anyway! So if you wanted to know your levels for sure, a blood test would be the way to go. Because I was convinced I had low iron, but my levels were fine, and it was actually more to do with dehydration (I don't drink enough cos I'm sick of having to pee all the time )

But yeah, other bellybellyers and the internet might know more.