It is a sorry thing to have have happen after all your hard work.
What are the lessons here?
You are going to learn how to block a quilt.
How to save time and disappointment in the future by washing fabric before you use it.
Wash fabric before you use it.
Wash fabric before you use it with a smile knowing you are doing the best thing for your quilt.
You will be able, in the future to piece your fabric with abandon, after they are washed.
There will be no worry about fabrics shrinking/ bleeding on future projects and what fun it will be without the worry.
peace