The same theme over and over?

Is it possible to struggle with the same theme over and over again? Because it’s making me worry. Why is it the same fear attacking me over and over again? Same theme, different situation. I don’t agree with it, I will never in my life ever hurt a child. It breaks my heart, if only I had HOCD that would be easier to deal with. I also heard that OCD can give you unwanted feelings that felt real in the moment. Is this true?