a. Yep you can definitely become anaemic.
b. However, even if you are deficient in iron, you can still have elevated RBC's and thus a raised hematocrit. When blasting anabolics, they will still be signalling the bone marrow to increase RBC production at a much higher rate than when not blasting. RBC's will increase but your MCHC will go down. Still bad as you'll have thick blood, because you still have lots of RBC's being produced, but on top of that, you also have poorly functioning red blood cells now, carrying less oxygen.
Ideally when blasting -> donate to keep hematocrit in range. Iron supplement to ensure you can produce adequate QUALITY of red blood cells as well as continuing to donate without going anaemic. Quite a balancing act when blasting.
Not medical advice. Consult a doctor.