cramps and short string?

I've been having pretty bad cramps (I've had my Skyla for six months) so I went to the doctor and they measured the string and said it was .5cm, as compared to 3cm when they put it in. This sounds pretty bad to me, but they said this is normal and should only be worried if I have pelvic pain and stuff, which I told them I did. I'm thinking I just want to get it taken out; if it's already this far up I'm sure it wouldn't take much for it to move up even further so that the strings are no longer present. What do y'all think I should do?