It could be that the hormones in the coil are causing weight gain. You might want to ask that question on the women's health forum. I'll also put a plug in for the weight loss & dieting forum - it has been so helpful to me as well as the recipes on the healthy cooking forum. After I had my surgery my thyroid levels balanced and I was finally able to lose weight. Good luck!
I am on my 10th week now so its been a while
How long has it been since your surgery? It took just over a month for mine to get down.