I've been on depo for 2 years. I was due for a shot in November of 2002, but I didn't get it and I have not since. I also haven't had my period yet. For the last two weeks I have been nauseous. I feel like I need to puke but instead I end up burping. But I burp so often that I feel like Im going to puke anyway. Some people have me thinking that I am, but I'm unsure and don't want to waste money for a test unless this is a real *sign*