No No No, you need to find out if your block is under or over sized first. put a stack of "post a note" down to measure your your 1/4 inch seam allowance. I think this is your problem. Put the needle down, and then measure where the 1/4 inch is and put the "post a note" down on that spot and remeasure it to be sure it is on the right spot. Sew a small piece of fabric and then measure it to see it it is accurate. Please do not cut your block with out measuring it first!!! It is very important to have all the blocks the same size.
Jan