19 weeks pregnant, have anemia and fear loosing my baby so much!?

I am 19 weeks pregnant and all seems fine, not had any problems. But i do have an iron deficiency that i have had from a young age. My doctor has been worried but it hasn't affected the baby. I have been given iron injections and tablets that have stabilized the level in my blood. I just can't stop thinking about how bad it would be to loose my baby and its worrying me so much. Did anyone else have this problem?