Nexplanon Pain After 6 months

So I had the Nexplanon inserted in January this year. Everything went smoothly and I honestly love it so far. No periods, no weird symptoms, it's great! But every once in a while, it will start hurting in my arm. Sometimes the pain will come randomly for a couple days then go back to normal. It's in the same place as always (I check it ALOT), but it feels like an aching pain. It doesn't feel like a nerve and doesn't go down my arm, it just hurts where the implant is. Anyone else deal with this or is it serious?