Can a low iron level of 8 stop me getting pregnant if not what could be stopping me conceiving as I'm otherwise healthy?

Iron. Hemoglobin 8 is low and you are anemic. Please take iron supplement to normalize your hemoglobin level. Eat balanced diet. If iron supplement does not help, please see your doctor to diagnose the cause of anemia. Probably, Hemoglobin 8 is not the cause for you not getting pregnant.