Have you grown this strain out before? Or seen it grow out?
It's hard to see, but it appears the buds aren't stacking, or should I say it doesn't look like they're going to, although it's still early.
There's nothing you can do now, but wait, and see. If more, and more orange hairs start poping, and receding that's not a good sign. Once cannabis had been pollinated, the hairs turn pre maturly orange, the hairs receed. Ratber than the plant putting it's energy into making seeds, bud development stops, or slows. The seeds would be too small to see at day 21.
The hairs should be sticking up, and out, as the hairs are looking for pollin to grab. The hairs do not look like they are sticking out.
Again, keep an eye out, anf post more pics in 10 days, or so