I only been on the shot for 6 months the second shot was my last shot on feb 15,2010. I never when back scent then it now jun 23, 2010 and my period still have not come on. Could i be pregnant? I take pregnancy test and it say negative do you that I would have to take a blood test just to make sure. Because my lower back be hurting, and belly be feeling funny, and my breast have milk in them