l have been on petogen for almost six months and experiencing bleeding brown to red blood in various quantities. these past few days l have been bleeding red blood randomly and l was thinking the injection has expired but now its back to brown blood. last year l experienced the same thing but l was not on petogen just strictly using condoms. what causes this? when will my period commence when l am no longer on the petogen injection? which is the other contraception that is user friendly and will guarantee no bleeding and mood swings?