Since I went onto the Depo in 2006 I didn't really have any problems. Throughout the time I was having these injections I still had light periods but only lasting for a few days. My last depo injection was in sept 2008 as we wanted to start trying to conceive, but since december 2008 I have been having bleeding after sex and I'm not sure why. I have had blood tests and was told there was no irregularities and also have been tested for chlamydia even though I have been with the same partner for 3 years. I'm really not sure what to do anymore and my doctor doesn't seem to bothered. Please Help.