Could I be pregnant on the arm implant?

Hi Ladies!! I'm pretty concerned and would appreciate if you take the time to answer and share your stories. I've had the implanon for 2 years and 5 months. I've had no issues with it and I would for the most part get a regular period up until the last couple of months I've been getting periods up to twice a month. My concern is that I've read that the implant loses its effectiveness a bit earlier especially if your over weight which I am I am 5'2 and 184lbs. I have been having some nausea throughout the day, headaches, I'm very irritated, tired, and frequently urinate which is very weird for me because this never happened before. I even wake up in the middle of the night to go pee. It's currently 5:50am (where I live) and I woke up to pee and can't go back to sleep. Any help or advice would be truly appreciated! Thank you for taking time to ready this!