Birth control.

So I’m currently on depo and have been since I had my son almost 2 years now. It’s made my period VERY irregular. It has helped me gain weight ( I was 98lb when I started, now 113 ) yay! But I am not liking how irregular my period is. I was thinking on changing to Nexplanon but I’ve heard it can move and travel throughout your body. I’m not sure what to do at the moment. Can you please share any advice or experiences? I know every body will react to it differently, but my OBGYN has always pushed me to get Nexplanon I’m just afraid to get it.