I am an 18 year old on depo-provera, and I know that irregular bleeding is normal, but I've been on the shot for about two and a half years now, so all irregular bleeding has basically gone away. The only time I bleed is occasionally during intercourse, which of course is very embarrassing. Recently, after having intercourse, there was blood but it wasn't regular thick, clotty blood like most blood from the vagina. It almost looked like it had been mixed with water because it was so thin and such a light red, but there was a lot of it. Should I be worried?