Low iron at 10 weeks 4 days

I sent an email to my midwife as my first appt is tomorrow, letting her know about some symptoms that I have that it just doesnt feel right.... headaches, extreme fatigue, weak, dizzy, cant concentrate, very thirsty all the time(water doesnt help). So she called me today and told me to get blood builder supplements for iron because she thinks I have an iron insuficiency, which I'm going to start taking today. Then she said she will send me to do blood work just to make sure is that.

My question is have any of you had it in so early in pregnancy? And did the supplements made you sick?