seeds?

I got some bag seeds almost ready for harvest. Was wondering if its common for female to produce seeds without a male. Pulled all males from grow son as I spotted them. Dried a few buds to test the weed and I found a couple seeds. I had 2 seeds out of about 1/2 oz.

Its not common for it to happen, but it dose every once in a while.
If it was fully pollenated it would have had a lot more seeds than just two.