Iron Levels low during pregnancy?

Gabriela • First time mom. 23. Due 06.26.17
I had my glucose test done and my iron Levels came back low. 
Normal range is 3.80-5.10 and I got 3.37.
I take my prenatal vitamin every night that has 30 mg of iron. I eat meat and chicken everyday. 
I am also eating more spinach and veggies.
How could I possibly be suffering from anemia??
Is their anything I can do???? I will be going back to the doctor in 2 weeks, but I wanted to start doing it on my own. 
Thanks!