Scares

Okay everybody, I need answers!! The other night I was going to take a shower and my nipples were purple. I am craving stuff I never do. I am coming off of the depo-Vera shot. Could I be pregnant or just side affects from not taking it. Should I wait till the 18th for my gynecologist appointment to have a pregnancy test taken or call my regular doctor ASAP to get one taken? What do you guys say?? My boyfriend and I are extremely scared. We have had scares before and nothing happened but this time we are actually worried.