depo can cause menstrual irregularities and inter menstrual bleeding
, pinkish discharge etc are some of them,
as cone biopsy
might have removed the abnormal cells and by this time the wound might have healed by all means that may not be causing this problem,
the side effects of depo will subside soon usually, if the symptoms persist or becomes severe better to consult your doctor once to rule out other causes and to take treatment like antifibrinolytics
to stop the bleeding.