yeah, i wouldn't chop a plant because it has a few seeds. you can get some mature weed thats worth smoking out of them, or you can pull it way early and get shit. i guess if you have a big set up and have another clone you can just drop in its place it would be alright, but as long as you don't see that plant throwing a bunch of nanners, i would let it grow. it might not even be that plant that self pollinated, it may be one of your other plants thats the nanner tosser.