Is It Okay if the First Set of Aligners Don't Feel Tight?

I just got my first set of invisalign aligners. I've been repeatedly told that I may feel some tightness and soreness for the first three days but that the pain should reside as time goes by. Weirdly, I haven't felt any tightness or soreness (and it's not because my teeth adjusted to them, I've litterally just got them). And because of this, I'm worried that the aligners are not doing what they're suppose to. It is okay that my first set of aligners don't feel tight or sore at all?