I have had an IUD placement for almost a year now. It's the first time I use a method of birth control, the first three months I had painful cramps and heavy bleeding, but then it went away and now I dont have a period. After ten months from the IUD placement now I am experiencing some weight gain, darkening and sensitivity of the nipples and I feel like I may be pregnant again?. Is it possible I am really pregnant though I have the IUD placement?