I got off my depo shot in July 2012. At first I was irregular then I became regular. My last normal period was November 2012. In December I have unprotected sex and a week later when my period suppose to come on, it doesn't. My period has been m.I.a since then. I have had a negative hot followed by a positive hpt. I went to the doctor and had a inconclusive followed by a negative urine test. Today I got my blood test which were negative. I am very frustrated. I have very strong symptoms. I'm nauseated, turned off from certain foods, emotional, exhausted, tender breast, the glow, headaches, cramps that are getting worse, backache, and now excessive peeing. I feel pregnant. But I'm wondering if I've tricked my mind or its something else. My doctors are puzzled as well. I have scheduled a ultrasound.Is it possible I am pregnant? And can lupus be a reason for all this?