I am 16 years old & I've had mirena for about 4 months now. I have these really bad cramps ALL the time. My breast have gotten bigger & I keep gaining weight even though I don't eat much & I walk everyday. I've never been pregnant before so I don't know if I am or not. I've taking pregancy test & they are all negative. Most of the time I am very tired & feel weak but I'm not sure what is causing it I know it can multiple of things I just don't know what? Can u help me? Anything that can help would be nice