Lara122, boy, we've all had one of those days! The UFO I'm trying to get finished (22 years old!) had a slight problem too. There were 7 large finished squares my daughter & her friends did at her 10th birthday party. Putting #7 on the front would make 2 more problems but later in the day while the squares were on the wall I watched Creative Backs on Craftsy. Its a free class & she has great ideas. She gave me a great solution. #7 is now on the back along with fabric left over when I trimmed down the massive blocks the girls did.
Maybe that would be something you could do, ie 1 or 2 strips of left over fabric in the back to add to the width. If you can watch the class you might come up with something you'll like.
best of luck