Iron??

Im 24 weeks pregnant 8 months ago i had my daughter i needed a blood transfusion cause my iron was low i started craving ice again so i called and told my obgyn and he prescribed me meds what if i take the iron pills and my iron is just fine and i get to much iron???? Should i take them or wait till my visit the 11th when he said he will check my iron incase he has too up my dose