Am I pregnant or is my birth control messing up?

Patient: I have the Nexplannon Implant for birth control. I have had it in my arm since July. It is always messing up my periods, and ive had unprotected sex. This month I got 3 1/2 days of discharge with clotting, and was told implantation bleeding does not have clots. Im paranoid, but if the birthcontrol would be effective before (all the other times) why wouldnt it be now? Do you think i’m pregnant?

Symptoms: Brown clotting and discharge