Complete surprise swarm today. We walked up just as it happened

Our hive swarmed today. We started this and one other packet from Tate honey farm on 4/13. One hive has already swarmed and is in the process of re-queening. one hive it appears swarmed today. So the "what to do" question is on. No clue. Do we re-queen so we don't have a gap in eggs, but risk a queen battle if we don't kill the queen cells? Do we let this hive re-queen naturally and lose 3-4 weeks of eggs.