menstruation after giving birth

please share your thoughts mga mommy, one month after giving birth niregla na ko agad if I am not mistaken march meron na ko, march-oct back to normal yung mens ko katulad ng mens ko nung di pa ko nanganganak the usual malakas and masakit puson but then nung nov di ako dinatnan bago ako nagkaroon puro yellow mens lang as in so kinabahan na ko I took pt but it was negative, then dec 13 nagkaroon ako pero biglang mahina na lang then now jan 12 nagkaroon ulit ako mahina ulit puro brown mens nung una but may red naman na nalabas nagtataka lang ako kasi di ako sanay na mahina ang regla exclusive breastfeeding ako, is there nothing to worry about? I'm sure I am not pregnant, #advicepls #pleasehelp #advicemommies