If you have other plants/strains growing in the room, cut it down so you dont run the risk of seeding out your whole room.
Some people would say that makes you a breeder, others differ on that opinion.
If that is the only strain you have, try to get some new genes asap.
If that is the only plant you have, then there is no harm in finishing it. just clean the room thoroughly to prevent pollen from effecting future flowering plants.