Taking oral contraceptives will make your cycles regular and put check on heavy flow.
But after pregnancy
because of hormonal
imbalance, body takes few months to keep cycles regular.
So again if you are breastfeeding
, i will not recommend taking OC pills.
If flow remains heavy and occurs on less interval for few more months; consult gynecologist to start OC pills.
Till then take iron, calcium supplements
, eat iron rich food like jaggery , dry fruits, leafy vegetales and fruits.