Nervous.

So I'm on the depo provera shot and I know not all birth control is 100% effective (unless you aren't having sex at all). My mom has been having fish dreams and the last time that happened, my niece was born. We all think it's my brother and his wife again, but I honestly don't know. So my SO wants me to take a pregnancy test to make sure I'm not. I really don't think I am. I haven't paid attention to my body lately. I guess what I'm trying to get at is I needed to vent a little. And has anyone ever been through this at all? Any advise?

Sorry it's so long.