Mine was 13.4 and the midwife asked me if I chewed on girders - she'd never seen levels so high. She said that she normally sees 11.8 - 12.5 in the 'good' range, rarely sees anyone above 12.5. So your level sounds perfect. I just checked my notes as I have the full printouts from the hospital screening tests, and the ideal range is given as 11.8 - 14.8 g/dl, just in case that helps anyone.
FYI, the iron test they do in antenatal checkups is the haemoglobin test. Haemoglobin is a type of protein found in the red blood cells that transports oxygen to the various parts of the body (and the baby...). They check the haemoglobin count, and also the pattern (how many normal/abnormal).
Ferritin is a different type of protein that stores iron - the ferritin test just checks how much iron your body has stored. The other tests mentioned are similar, related to other ways in which the body uses iron. It's the haemoglobin test that shows whether you have sickle-cell disease or thalassaemia, hence the most relevant.