Birth Control & Period

So since the 25th (which was when my period was due) ive been spotting but with old dark blood, last cycle I had a regular period for longer than usual (8days usually 5ish) and towards the end it got lighter, still with normal color blood

ive had my implant for a month

its been a week and I still have the spotting, mostly its when I wipe, should I be concerned?