Derek had told Garcia to get to the op center while he was still on the phone with Alexis, then he grabbed Emily's phone to text Callen while he kept talking to her. It wasn't the best way to get everyone moving, but he wasn't going to leave her alone.
He got to the op center with Emily and Reid, before starting to make all the necessary calls. Ambulance, doctor, team, everything was on its way and Derek was still on the phone trying to calm her down.