Hi Krystyna,
I assume you are taking the LIQS workshop, by the time you read this you will already be in the class. I hope that Linda left some leeway in the measurements. I took a class with Linda Hahn several years ago and had a great time, and really learned a lot.
If she didn't leave enough room in the cut pieces, remember you can always copy the pattern and shrink it so you can use the fabric you already cut.
Let us know what happened. I hope your class goes well!
(I've done things like you just did!!!!!!)