I can understand your state of mind and the confusion.Blood in stool
with depo proverb is very rare.
Also u have other gastrointestinal symptoms like stomach cramps
before passing stool.u might be having conditions like haemorrhoids or some inflammatory conditions of Howe.
U plz consult a gastroentrologists.
U might need biopsy
as u are loosing a lot of amount of blood.
Get treated appropriately.
Feel free to ask queries further.byeee.