Please help answer my questions about IUD

Patient: Hello.. I have 2 questions that I need answered, please.1. I have a spot on my left shoulder blade that tingles then does completely numb for about 5 minutes and it happens about 6 or 7 times a day? What could this be?2. I got an IUD about 6 months ago everything was going fine for about 3 months until my period completely stopped (I had unprotected sex because I thought i was safe from getting pregnant) It stopped until about 3 weeks ago when I had light bleeding on and off for about 2 weeks. and again no period. This really scares me..

Symptoms: 1. tingling and numbness
2. Light bleeding and discomfort after unprotected sex