Accept that it was the right mark and move along. Commit to it.
This reminds me of an exercise done in art, painting and drawing classes that I could never do. That one where you choose a mark, a brush and particular brushstroke and make the whole piece with just that. I could never do it. I look back on some recent stuff and see myself doing it, not consciously, but here I realized what I was doing. I always craved a bit more variety.