after 2months giving birth, nagpahabol ng bleed but dark blood

2 months going to 3months npo since nanganak ako, wala pang 1 month nag stop n bleeding ko siguro 2weeks or 3weeks ganun wala ng lumalabas healing nlng ng tahi ko non hinihintaygumaling. Tapos ngaun 11days to go konti nlng 3months na at nagulat ako my dugo ung underwear ko konti lng dinmn karamihan parang dami lng ng discharge ganun medyo dark blood nasya hndi sariwang dugo parang matagal n syang blood kc dark na e. Nangyare n dn po ba sainyo to? is this normal po? or baka rereglahin npo ako? btw mix feed ako formula and breastmilk also breastpump.