low Hemoglobin level during pregnancy

Hi Mommys, I am 27 weeks pregnant and last week my all tests are done where I found out my HG level is 9.8 and thats why my Dr. Increased iron tablets, now i am taking 2 tables. I am already eating beet root,apple, pomogranate,almonds,walnuts from 3 months but still it came low..is there anything which can help to increase my HB level naturally?