If you start seeing bugs everywhere—like, crawling on your walls in broad daylight, or you find them in your bed—then yeah, call a professional. If they’re biting you and leaving red welts, don’t mess around.
But if you see one or two tiny specks a week? Congrats, you’re a normal human. Your house is not “dirty.” It’s just a building that exists in nature. Nature always, always, wants back in.