Period/birth control/implanon

Savannah
I'm on my second implanon, I've had irregular periods since, well since I got my first period but the implanon decides that it comes and goes as it pleases. But ive had my period 2x in January and I just started spotting, again!! Could this be because the implanon is rejecting a fertilized egg? Or could it just be my period coming and going as it pleases. My body is so weird I don't know what to do.... the implanon is the only birth control that doesn't turn me into a psycho.. so I don't wanna take it out. Please someone help me.