Sis,
Yes, you are assuming correctly.
Since you appear to be a new quilter, may I also suggest the following: if your piece of fabric is one yard or less, once you have completed your pressing, fold you fabric with the selvages together. Fold your fabric twice (or once if it is a fat quarter), then lengthwise resulting in a neat stash pile. Now the problem will be to keep your piles neat. This is often a problem for me.
By folding in this manner, you will most always be cutting in the same direction (selvage to selvage). If you attempt to stretch your fabric you will find more stretch selvage to selvage vs. lengthwise. When stitching then, try to keep the "stretches" in the same direction. By doing this you will have fewer problems with one piece pushing along and getting longer. Hope this helps. Suzanne