first, if it happend, nothing you can do about it..
did you find it while it was immature? sacs take a while to mature, open up, and spread pollen. sacs are the concern.
lone nanners -- even if sevearl -- don't produce a ton of pollen because they don't have a full compliment of necessary anatomy. the sacs are the things that can pollinate entire room if 1 opens up. green nanners aren't doing anything. green / sealed up sacs aren't doing anything. so if you cuaght it before anythign matured, you are fine.
and, if oyu find a couple seeds per ounce, that's still not too big of a deal.
all depends on when you found it... how far along was it? ... did you miss any before that point?
you put in this much time, you might as well finish. if it is seeded, look into making bubble hash or any other extract that doesn't involve crushing or solvents...
dry ice hash, bubble hash are great ways to salveage seeded weed. the sieves will hold the seed back and you'll get the good stuff.