Side effects of implant?

So, I just dont have anywhere to put this and was wondering if anyone had been on Nexplanon. I got it back on 11/24/19. I have not had a period since 10/31/19 (before the implant was inserted). I have been dealing with a problem lately of the fact that no matter how much I eat, I still feel empty like I haven't eaten at all. I had a chance to ovulate before it was inserted, and even though they did a pregnancy test and it came up negative, I'm wondering if it's possible I could still be pregnant. Also, I'm curious if this is just a side effect to the Nexplanon.