My experience was that it can totally depend on the day and other circumstances. For me in the beginning, every time I did exposure therapy it was rough, and some days were VERY rough. Over time it got gradually easier, and over time the thoughts no longer bothered me.

Just keep putting in the work, allowing the thoughts to float by like clouds, and eventually they will not cause anxiety. Some days may be worse than others, and that's ok! Just do the best you can, that's all you can ask of yourself.