I just delver my baby by c-section 34 days ago and still have a little blood and brown mucus one time per day when it will stop? And what should I do

Keep an eye on it. This may not be abnormal as long as the discharge is not high volume, does not have foul odor, and is not causing any pain/fever. It is not uncommon for your uterus to continue to have spotting after a Cesarean section as your uterus heals; this would be more likely even if you're breastfeeding. This is not concerning right now, but keep an eye on your symptoms.