Were the balls close to the plant or hanging by a thin arm? Ifby the arm, are the bananas exposed and open, pointing down? If not, don't worry. Just get it out ASAP if you want to stay seed-free. Look for
what a pollen sac looks like once it's opened. It's pretty distinct, so don't worry too much if they aren't spread open.
another way to tell if your other plants have been polinated is to watch the hairs. If the plant get polinated the hairs will turn brown prematurely. If you notice the side of a plant that was right next to it has hairs turning brown but the other side of the plant is all white hairs still and the ones further away have no brown hairs, then you might have a pregnant lady.
the white hairs on the buds will turn brown because it did it's job and now it can stop feeding that part and focus the energy on making seeds.
Geven if just one sac opened your still fine, its not like one sac opens and ur plants turn to fully pollenated brick weed, id guess one seed to every 1/4 of an oz and thats even if they got pollenated at all, and if your plants get pollenated by a hermie dnt u get feminized seeds?
Oh and no the seeds r herms 2
I'm afraid
feminized seeds are just herm'd seeds with lower chances of actually herming out.