It appears as though the coil got misplaced. The position of the coil should be ascertained immediately. Please get a trans-vaginal sonogram as soon as possible to try to get to know the position of the IUD. Posterior displacement of the coil may cause the symptoms that you have been experiencing especially if you have a retroverted uterus
. Please see your gynecologist to get things sorted out and please do abstain until your check up. Hope you find this information useful. Wish you good health.