If you only have one plant in flower then just finish it. If you have access to other clones or plants do yourself a favor and get rid of your hermie.
once a portion of a plant is pollenated (branch, budsite, etc.), that portion of the plant will stop growing bud and switch to seed production. so you might
have a huge task on your hands trying to watch for signs of pollen sacks. plus they can pop up overnight.
I definitely second Mr. Jefferson...Don't use the seeds that this plant produces.

If your plant does seed out it means pollen is or was present. so be sure to clean your room well before you flower your next crop.