Question about Cramping.

Ok- so I have had a Marina IUC in since my littlest was 6 weeks old (he's almost 2) and have had no complaints there. Now, in the last few weeks I have been having cramps- started only at night or if I had done too much in a day (I've been down and out for a fractured hip due to severe osteoporosis- so I've only recently been up walking-after being down for more than 6months) and now it's getting worse. I have cramps almost all day, and have had several days where i'm super naucious (again, I take pain pills so there could be the reason for that) we live in the 'hills' and it's very twisty turney roads and I got CAR SICK last night. I haven't gotten car sick since I was pregnant with my 3rd kiddo. Now I noticed today that my boobs are sore and hard. DH wonders if I'm pregnant. NO WAY- right? Now he's got me all freaked out because I can't be pregnant again, and there is no way I can actually have another baby.

So- has anyone ever had pretty severe cramping with the Marina? Looking for any kind of imput. I will be calling the doc this week- but just wondering if anyone has BTDT with this issue.