I just started my second ever blackwork project, and it was going fine until I found that I went just a few threads too far. The mistake is almost right where I started, and since I'm doing double running stitch, I got pretty far without noticing. I really wish I could just click the undo button like on the computer. Does anyone have suggestions for fixing mistakes in blackwork or just counted thread type things? Do I have to take the whole thing out and start over?