I Have Been On Depo Provera Since October 22,2010, I Have bleeded for 1/2 months straight on my first inject of the depo... But, I dont think I have bleeded after sex before while on Depo.
It could be a side effect of the shot. How long have you been on the depo shot? or it could be irritation, a cut inside of you, sign of an STD, etc.