i have been on the DEPO-provera for over a year and with the past 3 months since i got my last shot. Recently i ended back on my old menstral cycle. Right before i went in to get my update of the DEPO-provera shot i ended up in the hospital for my appendix and they put me on meds for a little over a week. I also was under a lot of stress. Could both of those interfere with the DEPO-provera shot?