I have noticed it today as well I have a bad tendency of being a hypochondriac about my health. Some how the thought process of that I have not gotten myself tested for stds in a while got lodged in my head. And by sheer common sense I should know I have nothing to worried about. I have only one sexually active partner and we both have not been with anyone else, even though we are poly. It rolls around in my head cause I have had minor stds before in the past and it scares me it could happen again. And that he would leave for it. Even though he has told me he would not do so. I don't know why but when I am stuck in a car like I am now (on a road trip right ) it seems to make my mind wander