The vulva has a little part that sticks out. When a sheep is not pregnant, that points downward and is reasonably small. Halfway through pregnancy, it begins to lift and become horizontal, but at this stage it is pointing almost skywards. The vulva has become jelly like preparing for the imminent birth, the ligaments and muscles become relaxed. The vuvla swells and enlarges, somewhat protruding. When the ewe walks, it jiggles and the closer to delivery, the more jiggly it becomes.
Two of the three Cotswold ewes are very jiggly, enlarged and relaxed. They have also given birth before, so this is more pronounced, but the third ewe will be a first time mother. The ligaments are not as relaxed as a mother who has birthed previously. The sheep do not have full udders, though the three are all showing some enlargement. Some sheep will engorge only when the lamb is born, while others begin to fill with milk much earlier. The largest of the ewes for sure will have twins. She is waddling like an old goose at this point, and grunts when she lies down. She pees and defecates often, indicating there is not much room, and the pressure of the babies beginning to move into position for birthing, is putting pressure on her other functions.
Now, as a good shepherd, regular hourly checks should be made until late at night and then again early in the morning. Most of the time, the birth will progress without the need for intervention, though occasionally the lambs need to be turned if they are breach or presenting with the wrong parts first, or if they are too large for a first time mother to pass without a gentle pull. Cotswold babies are so cute. I can hardly wait!