low iron

So my 28week appointment I did my glucose screening and blood work passed the glucose but said my iron was low. Didn't tell me a number. OB gave me iron tablets. Today I had an appointment with WIC and they tested my iron and said it was a 9.8. I've been on the iron pills since then...she said it was really low and seemed concerned about it..should I be worried I'm currently 33 weeks with my first baby