Mirena Insertation

I got my Mirena for the first time Nov. 4th. I've had cramps that feel like a clamp clamped onto something further up me. I've explained this to my OBGYN and they said it should be normal to have pain and to take motrin and if it worsens to call them for an appointment. These past three days my nipples have been very swollen and tender to the touch. I called my doctor and she said it's possibly from hormones. Is this normal for anybody else? It's so bad i can't even wear a sports bra.