for some people yes this is completely normal and for others it is not. for me yes it is normal for me to question what I said and did with others. It becomes part of my OCD or PTSD when these thoughts and questionings interfere with my daily life.

my suggestion is if this continues to bother you contact a treatment provider who can diagnose whether this is normal with in you and if not get you treated for what ever it turns out to be with in you.