Can Copper T Usage Cause Weight Gain?

I have had my Copper T for about 8 months now. And I have noticed I am gaining weight. I look like im pregnant again. But I have a period each month, and my diet is as normal before preganancy my height is 5 3 and my weigh tis 70 kg. Actually I am doing exercise daily. SO my question is, What could be the problem? it's becoz of Copper T ? and I don't have any thyroid problem.