Hi shwetamoo,
The Hb level between 8-9 is not uncommon with thal minor pregnancies. There is no connection to iron deficiency, so unless there is a coinciding iron deficient anemia, IDA, taking iron won't budge the Hb level. Have you had an iron panel of tests done? This should always be done before thal minors take iron, but many doctors rely on Hb level alone, which cannot determine IDA in a thal minor. An iron panel would include tests for serum ferritin, serum iron and total iron binding capacity, TIBC. If these indicate IDA, then iron is appropriate. What dose are you taking of folic acid? 2-5 mg daily is suggested for thal minor women during pregnancy. Are you taking any other supplements? I always suggest 400-800 IU daily of natural vitamin E complex. That and folic acid may have more of a positive effect on your Hb than iron has. Folic acid is essential for building red blood cells. Transfusions are sometimes given to thal minors if their Hb gets much below 8. If yours continues to drop, it will become an option.