Dax didn't need the message sent to him, he could hear her yell for him. While he had healed from injuries from the hurricane he still moved a bit slower than normal so when she yelled it took him a bit longer to get to her. Finally, at her side, he tried to remain calm, at least outwardly, even though on the inside he was losing his proverbial shit.
"I'm here." He said noting the wetness from her water breaking. "We need to get you to the hospital." he said, as if that wasn't obvious. "Dad can meet us there." he wasn't going to let her argue or wait any longer, Dax simply flew into action as it were.