Good moring,I recieved my first Lupron shot (tx endo) in the latter part of september (approx. last week; 3 month doseage). I recieved my last period on 10/10/13 for about a week. Ive had my IUD (Mirena) since last year july. I had unprotected sex on 11/21/13-11/13/13. For the past three weeks, ive experienced sudden dizziness, lightheadedness (sitting and standing), light nausea, and cramping (minimally).Ive taken three pregnancy test and they were all negative. Oh, and I also take Vyvance daily 60mg. Could I be pregnant? If, not, what are these symptoms related to?