Yes, I have regret cutting my fabric a time or two. Now, I only cut fabric if they are smaller then 5" wide. And, truly, I am starting to leave my 2 1/2" wide fabric in strips. Because, they can be cut down as needed or used as a jelly roll or even Binding strips. And, after a fashion, I finally figured out what sized I use the most and only trim to those sizes.
Good luck finding what works the best for you.