Weird discharge after period? tmi i guess

Ellena
i've always had a day of brown discharge after my period, but this is really over the top.
i got the implant a few weeks ago (4-5) and this is my first period since getting it. i bled properly for about 8 days, and then i've had just over 5 days of a dark brown discharge. i don't know if i should be worried or not? it's the same type of discharge that i used to have, but it's been going on for much longer. 
can you girlies help me out? should i wait till my next period or just go and see my doctor?
thank you!!