Do you question your own code shortly after you wrote it?

Do you question your code shortly after you wrote it? I find myself questioning everything I have written weeks, even days after I have written it! I often contemplate rewriting everything. I wonder if this is normal behaviour or if I am just too worried about my code being shit instead of continuing on with projects before I just get worried and start everything over?

and if they aren't changing, it doesn't mean that it's perfect, but that it is acceptable enough to not motivate further work.