IUD WEIGHT GAIN

I have had my IUD for 9 months now and it has been checked multiple times, it is still in place. Working fine for me I guess. I have put on at least 10 pounds since I got it. I also have endometriosis and bloat so maybe that is it. But why am I still gaining weight steadily over time?? I put on 10 pounds over 6 months and it continues to rise still today. Now I’m up to like 15 pounds I’ve gained over 8 months. Someone give me some insight! Do you gain weight with the iud and if so is it quick or steadily? When does it stop?!