Where did these seeds come from???

I'm getting ready to harvest my babies on Saturday, but over the last week or so, I've snipped off a few buds to enjoy a little early. They smoke fine and the high has been great, but I've been a little dismayed to find a few (not a whole lot) of seeds in my buds. I was very meticulous to ensure I had removed all of my males within the first week or two of flowering and I consistently checked to make sure I didn't have any hermies either. So why am I getting seeds in my crop? Are a few errant seeds to be expected out of a large harvest or did I do something wrong?

Thanks for the advice.

You could have had a plant shock into a hermie. Can be very hard to spot once you have a lot of bud formations as the nut sacks can grow within the bud groupings. If your about to harvest I wouldn't worry to much, you hopefully wont have to many seeds and it will still be a good smoke. If you have a while to go and you cant see the nuts to cut you could treat it with Dutch Masters "Reverse". Its developed to kill off male organs in fruit crops with hermie tendencies.