When the pistil catches the pollen and it slides down into the calyx, a seed may develop. If it does, it'll keep growing and if it doesn't (for instance bad pollen) so no seed to grow. Pollen doesn't look like there's as much as there is because each drop is so small. It would be pretty hard to try and seed individual calyx's, so what you usually get is an entire seeded bud. Comparing my seeded bud with an unseeded one at the same level, they look pretty close to the same size, but once all the seeds are removed, that bud will probably not be very big (seeded buds are nice hash making candidates).