PARK CITY, Utah — Ashley Caldwell spent her last weekend before she gave birth shoveling 11 truckloads of dirt out of her driveway. It was Caldwell’s version of nesting at 37 weeks pregnant in mid-July. “‘Ashley, we don’t have to do all of it,’” said her husband, Justin Schoenefeld. “She was like, ‘No, we’re doing it all.’” Schoenefeld’s protest was light. He already knew little could dissuade Caldwell, 32, from trying difficult things. At only 13, Caldwell left her parents and two siblings in