I'm not sure about the effects of the shot (never been on it) but I had the same prob with the first test I took and it was because there wasnt enough urine on the stick and it took forever for the negative line to show up. Turns out i'm not pregnant (big sigh of relief after waiting over a week for my pd to decide to show up), but if you don't have yours in a few days you could test again. Good luck.

I cant say that the pregnancy test is right cause it doeasnt say pregnant or not pregnant my girlfriend and I bought the best you can buy if you want to be sure you should do the same that is if your as worried about it as much as we are!!!!

Also the depo might keep you from having period at all, that's what happened to my daughter in law