I have not this problem, my M had come 3 times already. About the same time and duration for everytime, only much more for the first time. You better to consult the doctor.
I also have the similar problem, every time after clearance of period, one week later, seems like it come again, and with very small amount only and they are fresh red, not brown.
I have checked with my doctor and he said it is only the hormone level not resumed to the normal level, should be ok after a few months. Or you can consider to take some hormone medicine, but really no need, from doctor's point of view.