I ve polycystic overies, how can i tell if my periods are normal or heavy coz i don't know what is the average healthy amount is[ve low iron reserves?

PCOS: Menstrual flow varies quite a bit from woman to woman, so it is hard to say what normal should be. I would suggest seeing your doctor, and having them check your blood count. That will determine whether your bone marrow is able to replace the blood you lose with each cycle, and also indicate if you are low on iron or not. Even with PCOS, it is unusual for intermittent menses to cause significant anemia.