Nexplanon and periods???

Tacara
Okay , so I have had the Nexplano. Implant for going on two years now. Since I have had it, I havent had a regular cylce. I used to spot for a few days after I had sex. But that doesnt happen anymore. Now i dont have anything. The last time I spotted or anything was almost two months ago. I am not sure if this is abnormal or not. The only other person I knew with it had a nonstop period for weeks-months lol. The app told me i should see a dr because it could be some syndrome i never heard of. If anyone could help me out and give me a little insight if you have experienced the same thing or not, that would be great. Thank you