I want to know if its normal to be spotting for more than 3 weeks being on the the depo injection. The first time i received it was on 6/2/2008 and didn't have any bleeding or spotting unitl 7/14/08. My last menstrual was on 5/21/08. My next injection won't be until 9/2/08.I'm kind of worried because of the spotting.I hope you could help me and give an answer of why is this happenning to me.