I did exactly the same thing... and I knew to alternate them... mind wasn't working properly.... a quilter told me to take out every other seam... and start again but I don't know which side I was stitching on.... however, it doesn't matter now as it has been tossed out with a lot of my stuff... whether by accident or on purpose I don't know... and the person responsible died... so that is that... it was a community quilt... things certainly happen in your life, don't they? Some good, some bad.