Copper IUD and Pregnant

Hi everyone,
So I got my copper IUD inserted in August 2014 so I've had it for around 1 year and 4 months and the only problems I had with it were bad cramps and heavy periods. Recently I stared having sex with my boyfriend (end of December until present) and I've been experiencing what I think are pregnancy symptoms (nausea, feeling sick, white discharge) for the past couple of days. I have had irregular periods which had just started becoming regular (maybe since September) and going by that my period is late by a few days. I have a test which I will take tomorrow morning. I don't know if I'm coming down with something or am just paranoid and freaking out.
Has this happened to anyone else?
Thanks.