Has she started nesting, eating and drinking less? If so she is in the first stage of labor. Especially at (now) 65 days.
Female dogs normally go 66 days of pregnancy before giving birth
Dogs don't have a mucous plug to pass and they are pregnant on average for 62-64 days. If she has had fluid passed vaginally, the sacs around on of the pups has likely ruptured. I strongly recommend contacting your veterinarian.