I've done that too, frogged the wrong row. I then go into the kitchen and really scrub a pot or the sink, work it out. I had a mistake happen several years ago. It wasn't my mistake. I was sewing bridemaids dresses for a client. She told me the 2 girls wear a size 14 and 16. I asked her several times "Are you sure these are the sizes as I will be cutting the material starting tomorrow?" Yep, that is the sizes for the dresses, they are my friends I know their sizes. I cut and sew and call the client to have the girls come for their fitting for hems, etc. They come, one is size 10 and the other girl is a 12. These dresses have boning to hold the shape and took a lot of work. I'm so upset, the girls think it's funny which makes me more upset. The client comes and apologize for the "mishap of wrong sizes" and will I 'adjust' the dresses. I tell her they must be taken completely apart and recut and it will cost will double. Her comment is, "I don't care, mom is paying for it." Mom did and she wasn't too happy about it. My last big sewing for wedding project, I had the girls come and I measured so I would not have another , "Oh, just 'adjust' them".