it is usually clear, slightly discolored, or has blood mixed it, but I have honestly never heard of green and large, and it is somthing you normally wipe away, not something you notice floating in a toilet, I mean I guess we could read up about it, but I have had 3 kids already and this is my 4th and I have never heard of
green discharge or
mucus plug. Could ask your doctor too, I suppose.