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if you have suspicions a lot of people will do some form of divination to find out if they are being worked on. (Tarot cards, scrying, reading tea leaves, etc.)
but I strongly advise to consider anything mundane that might be happening to you, such as a regular string of good or bad luck.
What KaliMon said and for me. may sound odd but if you did a cleansing and centering and etc...but yet you feel like some small string or something is still there...its an odd feel... you may want to look into cord cutting