I’m not sure what you mean by “karma period”.
Traditionally Saturn is connected to karma questions, since you’re asking about “ a planet”, but don’t forget about the nods.
As many people notice over the years, I too have defined certain situations and types of people that I keep seeing over and over again in my life. They mostly symbolize something I personally have to work on. Astrology is an excellent tool when it comes to recognizing and or confirming them.