Should I up iron intake?!

Alyssa
Right now, at 34.5 weeks pregnant, I'm taking 325 mg of ferrous sulfate twice a day. Doctor's orders. I noticed 2 days ago when I blow my nose, there is bright red blood and it's only increasing. So far no free-bleeding nose bleeds. 
I'm going to call my doctor's office Monday, but I know my doctor is out of town for the week, so I don't know if they can advise me properly. 
Do you think I should increase my iron intake to 3 times a day until I get word from my doctor? Does anyone know the harm in taking too much iron at this point in pregnancy?