THAT is a very good idea ...
Lay your blocks out and see what there is too lil of, what you have overdone and make a note for this months / next few blocks.
Im aiming that you have more than 12 blocks, if you make each and everyone, so you can choose your favourites or upsize your quilt from 12 to 16 blocks... and there's nothing wrong with a wee 9 blocker!
Each block will be 12" add an inch or two for your joining strips/binding and you could be looking at an approximate finished size of
9 blocks (3 x 3) 38" square ...
12 blocks (3 x 4) 38" x 50" ...
16 blocks (4 x 4) 50" square ...