Aligners seem looser after just 5 days?

When I initially got my aligners five days ago, they fit tightly and flush to my gums. I had a slight lisp and that's about all. Now, five days later, my upper aligner is definitely looser, especially at the gum  line and I'm finding that I'm spitting a lot when I talk  and the lisp is actually worse because of it. It seems that the gap between the gum and the aligner has loosened more above one front tooth than the other and that is where I'm spitting from! I can feel the saliva bubble forming! It;s annoying and a little gross! I'm hoping the aligner feels looser because I'm getting some good movement. Any thoughts??