Practically will not decrease. Blood will also continue to flow from the wound. Therefore, the very first and most important step in stopping bleeding is mechanical compression, application of a tourniquet, pressure bandage, clamping into the wound, etc.
In short, yes, it will. However, in cases of acute blood loss, this will accelerate hypovolemic shock and DIC, and the delay in hemostatic measures caused by such actions makes this idea a stupid square.