Understanding Potential Pregnancy After Depo Shot & Irregular Periods

Question
So I THINK I started my period 3/1/11 maybe a little sooner and believe I ended on 3/5/11. I have always had speradic periods so I don't know when I ovulate. I had unprotected sex on the 9th and 10th on the 10th I received the first depo shot. I have taken pregnancy test but I think to early. I have been so tierd And only get the sick feeling in the evening my appetite has dropped because nothing sound appealing I took a pregnancy test again today 3/25/11 at the doctors office it was neg I asked for blood work but she said it would have showed positive I'm still worried.... What are the chances of me being pregnant? I know I wasnt "pregnant" when I got the shot I know it takes time for implantation but could the embryo even implant after the shot. I realy need answers because I feel like iv been running in circles trying to figure this out.

Answer
The chances if you being pregnant is almost nil after taking a shot of depo, and the symptoms you have been experiencing are related to depo shot and not pregnancy.

PS: There seems to be some problem with my email and many emails from all experts is going into the spam folder. Therefore if you have a follow up question kindly go to this page http://www.pregnancyandchildcare.info/quanda/index.html and leave your question there. It will help me answer your queries faster.