This is my third depo shot. Almost due for my fourth. I have had abnormal bleeding with each shot but mostly spotting here and there. This third shot however, I have bled pretty continuously. Lately though my bleeding only seems to come after vigorous exercise. If I take a few days off, my bleeding stops. But if I do a vigorous workout, it starts up again. Is this depo related or exercise related!?

Other info: I have a predisposition to prolapse after two childbirths, normal pap and STD tests from a recent doctors visit. I am married with one partner for the past 10 years... The bleeding blows my mind...