No trichomes in bloom on seeded plants

Well, I'm not sure what happened but I swear it was a complete post when i posted ... let me try that again ..
On my second grow which are autos that I'm propagating for a seed crop.
Into the fourth week of flowering and trichomes are still quite sparse.
Is that to be expected when the flowers have seeds?

could be genetic.
but yea females stop producin thc and start producin seeds once its pollenated

I'm pretty sure that once pollinated, they stop producing THC. Try flowering the plant and getting larger buds, that way you may get even more seeds.