Random Seeds?!?

I have two systems in one room. Just trimming the 1st and I have found random seeds in a couple of the plants.

I am wondering if I should worry about the second system being pollinated as well? Should I pull everything out and bleach the room or is it too late and pointless to do that now? How long can the pollen remain viable and in the room?

Just wondering how this happened, since it is random in several, but not all of the plants. Just a seed here and a seed there. Weird.

bump...............

You probably had a bit of a hermie, it pollinated inside the bud you probably don't have to worry. If it did pollinate its already too late. Clean the room when this cycle is done.