Had Implanon Removed Sept 2016 Got My Period October And

Had implanon removed Sept 2016 got my period October and November 2016...skipped December and January...still no period and it's Feb already...took 3 test clear blue included and i got negative results...I'm wondering can the implanon weaken ur hcg...and can tht b the cause of the nagative results...I do get symptoms...don't knw wat to do r think please answ me...is it possible that I might be pregnant????