Honestly, I think so. I can't understand how though. If I drink enough to be drunk, nothing... if I have a few beers or a glass of wine, hardly enough to even feel it, I bleed enough to stain. Very...
Depo is said to be over 99.9% effective against pregnancy, but anything is possible. It is highly unlikely especially since Depo is effective within 24 hours of having the shot. If you are worried...