Nexplanon implant side effects?

I got the Nexplanon implant about 2 months ago. Since then it seem like I'm constantly hungry, and I am constantly having cravings. 
Have any of you ladies experience the same thing???
Also, my first month on this birth control I had a 2 1/2 week long period. I figured that it was due to the fact the my old birth control made me not have periods. But anyone experience this as well??