Hey there! I had red dots on my scalp about 3 weeks after my hair transplant too. It's actually a pretty common thing to experience post-op. For me, they started fading after about a month or so. Just make sure to follow your aftercare instructions and keep the area clean and moisturized.
If you're still concerned, it never hurts to reach out to your transplant surgeon for some reassurance. But from my experience, those red dots should start disappearing soon. Just hang in there!