Shit happens.
If you find 2 seeds in an entire plant, it's no big deal. A nanner was likely buried in the flower. Lone nanners don't produce much pollen, typically.
It is unwise to plant them. If they came from a plant that hermied with low-stress, that's a very bad trait that can be passed on to the next generation. If it was selfed, you also have an inbred plant that will be less robust than the previous generation.
If you think it came from a male plant somehow, that'd be okay to use.
If you want to make Fem seeds, read my week 2 in my 1 diary. sigma aldritch has teh recipe for Silver Thiosulfate (STS) - needs additional dilution. It's quite cheap and easy to make. You apply it 3 times 5 days apart and you force a h erm -- preferably a plant that is very resistent to hermaphroditism in the first place for reasons explained above. This is a different context because the STS acts like or blocks a particular hormone in the plant and forces a herm vs the plant naturally doing it on its own. It's not stressing the plant but fuckign with it chemically inside, lol. it does stress it a bit, but stress is not the cause of the herm.
Start the herm plant on flower cycle (12/12) 1 week ahead of pollen receivers.