Implanon cause headaches & Period questions

Elizabeth
I have the Implanon , The implant under the arm and Ive had it for a month , Ive been gettin lots of headaches lately and my period is brown I get brown discharge is that normal? I havent had my period in 2 months because I was on the depo shot in Janurary and I got the Implanon after 3 months of the depo