Uterus not contracting after baby is removed

Has anyone else experienced their uterus not contracting after there baby was removed from it during a c section? I was rushed in for an emergency c section due to babies heartrate dropping after 48 hours in labour. Once my baby was born my uterus which is ment to contract back down wasnt doing anything. They called in a specialist and after hours of surgery they stiched and wrapped my uterus up to get it back in. They never expessed any concerns about future children being possible only that i had to wait at least a year until i should get pregnant again as my uterus would be too weak to carry a baby. Im now getting worried as its 4 months pp and i still haven't had my period and im worried my uterus is damaged.