this is pretty much one of my main fears i sometimes have intrusive thoughts about irrational fears in the past i may or may not have done sometimes as far back as several years ago this is something that ive talked to my therapist about and one of the only things you can do is just accept it and move on and deal with any consequences should they arise which they most likely wont since these are irrational thoughts to begin with because its just not possible physically or mentally to truly make sure you didnt do anything unwanted in the past especially if it was years ago  but yeah this is probably one of my larger more irrational fears and it definitely is hard dealing with it