IUD

Has anyone got pregnant on the IUD?
About 4 weeks ago I had all pregnancy symptoms, tender breasts, nausea, blotted, tired as anything and wanting to only eat chocolate.. and also going to the toilet heaps!! A week later all the symptoms apart from the tiredness and eating chocolate had gone. I feel sick sometimes when I do a hard workout at the gym. I don't get a period so have no idea how far along I would be but I am guessing that I got pregnant sometime in September when I was away in OZ and hubby used expired condoms and I felt strings on the IUD one day.

I have at least two friends who have become pregnant while using IUD - weren't fitted correctly or dislodged or whatever can happen. Might be best to test just in case.