Just use the fabric that you washed-- it doesn't make that big of a difference.
A note for the future however is that if you're going to use (or may at some point use) fabric with pre-cuts, you won't want to have washed the "loose" fabric since you can't wash the pre-cut fabric.
I don't wash my fabric until I'm ready to use it and that way, I can decide if I want to combine it with pre-cut stuff.
HTH,
Marcia