Implant - period

Gemma
So I got my implant done in January so it's been a while never got any symptoms 
However my periods reduced dramatically to nothing just bits of what I would call discharge. 
However 3 weeks ago I started my period (which was just little discharge) and its continued to this day however it's getting heavier. Any advice ?
Details : 16 years old .. In relationship. Frequently have sex.