Such is the curse of doodling with an ink pen. No take backs.
You should do it more often! For years I never drew in pen, or if I did, I'd draw in pencil first and trace over it. When I finally ditched the pencil and eraser for straight ink I found the opposite of what I expected to be true: I felt freer, more in control, and happier with my work. Now I do all my drawing in Uniball, and I've only used a pencil for art once in the past 3 years, and that was because the scale of the piece is so large. Ink's the best!