It happens to all of us sometimes, I think. I almost always have to lay out the pieces, take a picture of them the way I intend to sew them and then have that picture up on my laptop screen near the sewing machine so that I can keep track. As others mentioned, I have to put a pin in the seam I intend to sew before I carry the pieces to the machine, and I have to sew them in a ritual order. Sometimes I mess up in spite of all this. My short term memory is shot, and I have no attention span. I've been like this at least since my late 20's, which is, shall we say, a lot of years of practice in trying to avoid unintended sewing results. Tomorrow will surely be better for you!