I would also keep the pregnant sow in her own cage, as some gals can get hormonal and grouchy towards other pigs. Some sows do fine together with cagemates during pregnancy/delivery and will even help clean off the pups, but again there is the risk that a cagemate might hurt or kill the mother's pups.
I divided off a 2x4 section of my C&C cage for Stella to deliver her litter in. She could still see and smell the other girls but they did not interact.
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